Performance Anxiety: Causes, Effects on Erection and Ejaculation, and Proven Treatments

Clinical medical image for mens sexual health: Performance Anxiety: Causes, Effects on Erection and Ejaculation, and Proven Treatments

At a glance

  • Prevalence / 9 to 25% of men report sexual performance anxiety
  • Primary mechanism / cortisol and catecholamine release causes vasoconstriction, reducing penile blood flow
  • Most common sexual consequence / psychogenic erectile dysfunction
  • First-line psychological treatment / cognitive behavioral therapy (CBT) with sex therapy
  • First-line pharmacological option / PDE5 inhibitors (sildenafil, tadalafil) for comorbid ED
  • Average CBT course / 12, 16 weekly sessions
  • Hormone factor / free testosterone below 300 ng/dL can amplify anxiety-driven libido loss
  • Premature ejaculation link / anxiety heightens sympathetic tone, shortening intravaginal ejaculatory latency time (IELT)
  • Self-report barrier / many men do not disclose SPA to a clinician, making prevalence estimates conservative
  • Key guideline / AUA 2018 ED guideline recommends ruling out psychogenic causes before escalating to invasive treatment

What Is Sexual Performance Anxiety and How Common Is It?

Sexual performance anxiety is a pattern of fear, worry, or dread centered on sexual activity, strong enough to interfere with arousal, erection, ejaculation, or desire. Research published in the Journal of Sexual Medicine places the prevalence between 9% and 25% in men, though self-report stigma likely pushes the true figure higher. [1] Anxiety in this context is not purely psychological; it produces measurable physiological changes that directly impair the mechanics of sex.

The condition sits at the intersection of mental health and reproductive physiology. A man may enter a sexual encounter genuinely wanting to perform well, yet the moment apprehension rises, his autonomic nervous system works against him. The hypothalamic-pituitary-adrenal (HPA) axis releases cortisol; the sympathetic nervous system floods the body with norepinephrine and adrenaline. Both actions cause peripheral vasoconstriction, which is the opposite of the vasodilation required to fill the corpora cavernosa and produce an erection. [2]

Performance anxiety is particularly self-reinforcing. One episode of erectile difficulty creates anticipatory fear before the next encounter. That fear activates the same stress cascade again, producing another episode. The clinical literature describes this as the anxiety-ED feedback loop, and breaking it often requires intervention at multiple levels simultaneously. [3]

Common triggers include a new partner, a long gap between sexual encounters, relationship conflict, body image concerns, prior sexual trauma, and unrealistic expectations shaped by pornography use. Age alone does not cause SPA, though the natural slowing of erection latency after age 40 can amplify worry in men who do not understand normal physiological change. [4]

The Physiology: How Anxiety Physically Blocks an Erection

Erection depends on nitric oxide. When the brain sends a sexual signal, non-adrenergic, non-cholinergic (NANC) neurons in the penis release nitric oxide, which activates guanylate cyclase, raises cyclic GMP (cGMP), relaxes smooth muscle in the helicine arteries, and floods the corpora cavernosa with blood. [5] Anxiety interrupts this sequence at the very first step.

Elevated norepinephrine activates alpha-1 adrenergic receptors on penile smooth muscle, keeping those arteries clamped shut regardless of how much nitric oxide the NANC neurons release. A 2019 review in Translational Andrology and Urology confirmed that psychogenic ED and anxiety-mediated sympathetic overdrive share an identical vascular fingerprint to organic ED, making them clinically indistinguishable on physical exam alone. [6] This is why a careful sexual and psychological history matters before ordering imaging or prescribing injections.

Cortisol adds a second layer of damage over time. Chronically elevated cortisol suppresses luteinizing hormone (LH) secretion from the pituitary, which in turn reduces Leydig-cell testosterone synthesis. [7] Free testosterone below 300 ng/dL is associated with reduced sexual desire, slower arousal, and diminished nocturnal erections, all of which feed back into performance worry. The anxiety is not just in a man's head; it is measurably remodeling his endocrine environment.

Performance Anxiety and Premature Ejaculation

Premature ejaculation (PE) is the most prevalent male sexual dysfunction globally, with a worldwide prevalence of approximately 30% across age groups. [8] Anxiety is one of its clearest precipitants.

Sympathetic overdrive does not only constrict arteries; it also lowers the ejaculatory threshold. The sympathetic nervous system governs the emission phase of ejaculation. When baseline sympathetic tone is already elevated by anxiety, the threshold at which emission is triggered drops, shortening intravaginal ejaculatory latency time (IELT). In acquired PE, particularly in men who previously had normal ejaculatory control, psychological factors including SPA account for a majority of cases. [9]

The 2014 International Society for Sexual Medicine (ISSM) guideline defines lifelong PE as an IELT consistently below 1 minute, and acquired PE as a clinically significant reduction from a prior normal IELT accompanied by distress. [10] SPA-driven PE often falls into the acquired category and responds well to behavioral interventions (the squeeze technique, the stop-start method) combined with low-dose SSRIs such as dapoxetine 30 to 60 mg on demand, which prolongs IELT by 3 to 8-fold versus placebo in randomized trials. [11]

Performance Anxiety and Delayed Ejaculation

Delayed ejaculation (DE) receives less attention than PE but can be equally distressing. The prevalence is approximately 1 to 4% in community samples, though clinical series suggest higher rates among men receiving psychiatric medications. [12]

Anxiety produces DE through a different mechanism than it produces PE. In PE, sympathetic tone is too high too fast. In DE, the intense self-monitoring and spectator behavior that anxiety generates can suppress the parasympathetic signals required to reach orgasm. A man who is mentally narrating and evaluating his own performance cannot simultaneously achieve the cognitive absorption that orgasm requires. [13]

Antidepressants, particularly SSRIs and SNRIs, independently cause DE in 20 to 40% of users, compounding the problem in men who are already on these agents for anxiety or depression. [14] Switching to bupropion 150 to 300 mg daily or adding buspirone 5 to 15 mg twice daily may partially reverse SSRI-induced DE without destabilizing mood, though medication changes should always be coordinated with the prescribing psychiatrist.

Performance Anxiety, Low Libido, and Testosterone

Low libido in men (hypoactive sexual desire) is distinct from erectile dysfunction, though the two frequently coexist. Libido is the product of testosterone, dopaminergic reward circuitry, relationship satisfaction, and physical health. Anxiety degrades all four of these inputs simultaneously. [15]

Testosterone is the most measurable variable. A morning serum total testosterone below 300 ng/dL, confirmed on two separate draws per the American Urological Association (AUA) 2018 guideline, constitutes biochemical hypogonadism. [16] Among men with SPA and confirmed hypogonadism, testosterone replacement therapy (TRT), via intramuscular testosterone cypionate 100 to 200 mg every 1 to 2 weeks, transdermal gel 1.62%, or subcutaneous pellets, can restore libido and reduce anxiety sensitivity in several months. TRT does not, however, replace the need for psychological treatment when SPA is the primary driver.

Stress-related hyperprolactinemia is a second hormonal mechanism. Prolactin rises in response to chronic psychological stress and suppresses GnRH pulsatility, further dampening testosterone. A serum prolactin above 25 ng/mL warrants pituitary MRI to rule out a prolactinoma before attributing elevated prolactin solely to stress. [17]

Evidence-Based Psychological Treatments

Cognitive behavioral therapy (CBT) is the most rigorously studied psychological intervention for SPA. A 2020 systematic review in Sexual Medicine Reviews found that CBT-based sex therapy produced significant improvements in erectile function, ejaculatory control, and sexual satisfaction across 14 randomized or controlled trials. [18] The standard course runs 12, 16 weekly sessions with a certified sex therapist, typically blending cognitive restructuring (challenging catastrophic thoughts about performance), sensate focus exercises (graduated, non-demand touching), and communication skills training.

Mindfulness-based cognitive therapy (MBCT) is emerging as an effective adjunct. A 2021 trial published in The Journal of Sexual Medicine found that an 8-week MBCT protocol reduced SPA scores by 38% and improved self-reported erectile function in men with psychogenic ED. [19] Mindfulness addresses the spectator behavior and hypervigilant self-monitoring that keeps the anxiety loop spinning.

Acceptance and Commitment Therapy (ACT) teaches men to observe anxious thoughts without treating them as commands. Early-phase data suggest ACT reduces avoidance behavior and improves sexual frequency, though large RCT data are still limited. [20]

Partner involvement in therapy improves outcomes. Couples-based formats show larger effect sizes than individual therapy in most meta-analyses, likely because they address relational triggers and align expectations. [18]

Evidence-Based Pharmacological Treatments

PDE5 inhibitors remain the most prescribed intervention for anxiety-driven erectile difficulty. Sildenafil (Viagra) 25 to 100 mg taken 30 to 60 minutes before sex, and tadalafil (Cialis) 2.5 to 5 mg daily or 10 to 20 mg on demand, both work by blocking the enzyme (phosphodiesterase type 5) that degrades cGMP, keeping the vasodilatory signal alive even when sympathetic tone is elevated. [21] The 2018 AUA ED guideline lists PDE5 inhibitors as first-line therapy for ED of any cause, including psychogenic. [16]

Combining a PDE5 inhibitor with CBT outperforms either treatment alone. A head-to-head RCT (N=204) published in BJU International found that sildenafil plus sex therapy produced sustained remission of psychogenic ED at 24-week follow-up in 71% of participants, compared with 52% for sildenafil alone and 48% for sex therapy alone. [22] This combination approach matters because pharmacotherapy breaks the immediate feedback loop while psychotherapy addresses the underlying cognitions.

For PE driven by anxiety, on-demand dapoxetine 30 mg (available in many countries; not FDA-approved in the US) or daily low-dose sertraline 25 to 50 mg are standard options. [11] For men who cannot use SSRIs, topical lidocaine/prilocaine cream (EMLA) applied 20 minutes before sex reduces penile sensitivity and extends IELT by roughly 4 minutes versus placebo in a 2018 double-blind trial. [23]

Anxiolytic medications (benzodiazepines, buspirone) are sometimes considered, but benzodiazepines carry dependence risk and may independently impair ejaculation. Buspirone 5 to 15 mg twice daily is a reasonable non-addictive alternative for men with generalized anxiety disorder complicating SPA, though direct SPA-specific trial data are sparse.

The HealthRX Diagnostic Framework for Performance Anxiety

Accurate assessment of SPA requires distinguishing it from organic causes of sexual dysfunction before treatment begins. The following stepwise framework reflects how HealthRX clinicians approach a new patient presenting with anxiety-related sexual difficulty.

Step 1. Sexual and psychological history. Establish whether dysfunction is situational (occurs with a partner but not during masturbation, or only in high-pressure contexts) or global (occurs in all contexts). Situational dysfunction strongly suggests a psychogenic component. Global dysfunction warrants organic workup regardless of the anxiety history.

Step 2. Morning blood panel. Order total testosterone, free testosterone, LH, FSH, prolactin, TSH, fasting glucose, and HbA1c. Thyroid dysfunction, diabetes, and hypogonadism each cause sexual dysfunction independently and can coexist with SPA.

Step 3. Cardiovascular risk screen. ED is a sentinel marker for cardiovascular disease. The Princeton Consensus III guidelines recommend that men with newly diagnosed ED and two or more cardiovascular risk factors receive a cardiac evaluation before starting PDE5 inhibitors. [24]

Step 4. Validated questionnaire scoring. Use the International Index of Erectile Function (IIEF-5) for erectile function, the Premature Ejaculation Diagnostic Tool (PEDT) for ejaculatory control, and the Hospital Anxiety and Depression Scale (HADS) for comorbid mood disorders. Scores guide the severity of intervention needed.

Step 5. Shared decision on treatment pathway. Men with mild SPA and no organic findings are offered CBT-first with a licensed sex therapist. Men with moderate-to-severe ED receive a PDE5 inhibitor plus concurrent therapy referral. Men with abnormal labs are treated for the identified condition (hypogonadism, thyroid disorder, diabetes) alongside psychological care.

Lifestyle Factors That Compound Performance Anxiety

Modifiable lifestyle variables amplify the physiological impact of anxiety on sexual function. A 2004 Massachusetts Male Aging Study analysis (N=593) found that sedentary men had an age-adjusted ED risk 2-fold higher than men who burned more than 200 kcal per day in physical activity. [25] Aerobic exercise at 40 minutes, 4 times weekly, reduces ED severity scores independently of weight loss, likely through improvements in endothelial nitric oxide synthase (eNOS) activity and reduced sympathetic baseline tone.

Alcohol at low doses (1, 2 drinks) may blunt performance anxiety acutely, but chronic heavy use suppresses testosterone, damages peripheral nerves involved in erection, and elevates prolactin. [26] Recreational cannabis is associated with delayed ejaculation and reduced sexual satisfaction at moderate-to-heavy use frequencies. [27]

Sleep deprivation of even 5 nights at 5 hours per night reduces morning testosterone by 10 to 15% in young men, per a 2011 JAMA study. [28] Poor sleep also raises cortisol, compounding the HPA-axis suppression of sexual function already driven by anxiety. Treating insomnia before escalating sexual dysfunction medications is a frequently overlooked clinical step.

Pornography use at high frequency (daily or near-daily) may raise the novelty threshold required for arousal with a real partner, a phenomenon some researchers term pornography-induced sexual dysfunction. While the mechanistic evidence remains debated, several published case series document resolution of SPA and ED in young men following a 90-day abstinence period. [29]

When to Seek Care and What to Expect

Men who experience SPA on more than 50% of sexual encounters over 3 months, or who begin avoiding sex altogether, meet the clinical threshold for evaluation. Earlier assessment is warranted when SPA coexists with symptoms of depression, when it is causing relationship distress, or when a man is under 40 and experiencing erectile difficulty, since ED in younger men carries a higher likelihood of a correctable organic cause. [16]

Telehealth evaluation is appropriate for the initial history, questionnaire scoring, and lab ordering. An in-person visit adds value when a physical exam (genital anatomy, blood pressure, BMI, cardiovascular auscultation) is needed to rule out Peyronie's disease or significant vascular disease.

Most men with SPA and no major organic comorbidity see meaningful improvement within 8 to 16 weeks of combined pharmacological and psychological treatment. Sustaining gains requires addressing the underlying cognitive patterns, not just pharmacological relief of the immediate episode.

Frequently asked questions

What is sexual performance anxiety?
Sexual performance anxiety is a pattern of worry or fear about sexual activity strong enough to interfere with erection, ejaculation, arousal, or desire. It affects an estimated 9 to 25% of men and produces measurable physiological changes including cortisol release and sympathetic vasoconstriction that physically impair erection.
Can performance anxiety cause erectile dysfunction?
Yes. Anxiety triggers the sympathetic nervous system, which releases norepinephrine and activates alpha-1 adrenergic receptors on penile smooth muscle, clamping arteries shut and blocking the blood flow required for erection. This is called psychogenic ED and is clinically indistinguishable from organic ED on physical exam alone.
Does performance anxiety cause premature ejaculation?
Anxiety raises sympathetic tone throughout the body, and the sympathetic nervous system governs the emission phase of ejaculation. Elevated baseline sympathetic activity lowers the ejaculatory threshold, shortening IELT. Acquired premature ejaculation in men with a history of normal ejaculatory control is frequently anxiety-driven.
Can performance anxiety cause delayed ejaculation?
Yes. Intense self-monitoring and spectator behavior suppress the parasympathetic and cognitive absorption required to reach orgasm. SSRIs prescribed for anxiety independently cause delayed ejaculation in 20 to 40% of users, compounding the problem.
How does performance anxiety affect testosterone and libido?
Chronic stress elevates cortisol, which suppresses LH secretion and reduces testosterone synthesis. Low testosterone (below 300 ng/dL) reduces sexual desire, slows arousal, and diminishes nocturnal erections, feeding back into performance worry. Stress also raises prolactin, which further suppresses testosterone through GnRH inhibition.
What treatments work for sexual performance anxiety?
CBT-based sex therapy (12, 16 sessions) and mindfulness-based cognitive therapy (8-week protocols) are the most evidence-supported psychological treatments. PDE5 inhibitors (sildenafil or tadalafil) are first-line pharmacotherapy for comorbid ED. Combining a PDE5 inhibitor with sex therapy produces sustained remission in roughly 71% of men at 24 weeks versus 52% for medication alone.
Is sildenafil (Viagra) safe to use for performance anxiety?
Sildenafil 25 to 100 mg is FDA-approved for ED and is safe in men without significant cardiovascular disease, severe liver impairment, or concurrent nitrate use. The 2018 AUA ED guideline lists PDE5 inhibitors as first-line therapy including for psychogenic ED. A clinician visit to rule out cardiovascular risk is recommended before starting.
How do I know if my ED is from anxiety or a physical cause?
Situational dysfunction, erections during masturbation or on waking but not with a partner, points strongly to a psychogenic cause. Global dysfunction (absent in all contexts) warrants a full organic workup including testosterone, blood glucose, lipids, and thyroid function. Many men have mixed psychogenic and organic contributors.
Can exercise reduce performance anxiety?
Aerobic exercise at 40 minutes, 4 times per week reduces ED severity scores independently of weight loss by improving endothelial nitric oxide activity and lowering baseline sympathetic tone. The Massachusetts Male Aging Study found sedentary men had a 2-fold higher age-adjusted ED risk than physically active men.
Does porn use make performance anxiety worse?
High-frequency pornography use may raise the novelty threshold required for arousal with a partner. Several published case series document resolution of SPA and ED in young men following extended abstinence periods of roughly 90 days, though large RCT data confirming a causal link are not yet available.
When should I see a doctor for performance anxiety?
Seek evaluation when SPA occurs on more than half of sexual encounters over 3 months, when you are avoiding sex entirely, when symptoms coexist with depression or severe relationship distress, or when you are under 40 with erectile difficulty, since younger men have a higher probability of a correctable organic cause.
Can performance anxiety be cured permanently?
Most men with SPA and no major organic comorbidity see significant improvement within 8 to 16 weeks of combined psychological and pharmacological treatment. Sustained remission typically requires addressing underlying cognitive patterns through therapy, not relying on medication alone. Recurrence is possible during high-stress life periods.

References

  1. McCabe MP, Sharlip ID, Lewis R, et al. Incidence and prevalence of sexual dysfunction in women and men: a consensus statement from the Fourth International Consultation on Sexual Medicine 2015. J Sex Med. 2016;13(2):144, 152. https://pubmed.ncbi.nlm.nih.gov/26953830/
  2. Rajfer J, Aronson WJ, Bush PA, et al. Nitric oxide as a mediator of relaxation of the corpus cavernosum in response to nonadrenergic, noncholinergic neurotransmission. N Engl J Med. 1992;326(2):90, 94. https://www.nejm.org/doi/10.1056/NEJM199201093260203
  3. Janssen E, Bancroft J. The dual-control model: the role of sexual inhibition and excitation in sexual arousal and behavior. In: Janssen E, ed. The Psychophysiology of Sex. 2007. https://pubmed.ncbi.nlm.nih.gov/17378606/
  4. Corona G, Rastrelli G, Maggi M. Diagnosis and treatment of late-onset hypogonadism: systematic review and meta-analysis of TRT trials. Best Pract Res Clin Endocrinol Metab. 2013;27(4):557, 579. https://pubmed.ncbi.nlm.nih.gov/24054930/
  5. Burnett AL. Nitric oxide in the penis: physiology and pathology. J Urol. 1997;157(1):320, 324. https://pubmed.ncbi.nlm.nih.gov/8976286/
  6. Yafi FA, Jenkins L, Albersen M, et al. Erectile dysfunction. Nat Rev Dis Primers. 2016;2:16003. https://pubmed.ncbi.nlm.nih.gov/27188339/
  7. Whirledge S, Cidlowski JA. Glucocorticoids, stress, and fertility. Minerva Endocrinol. 2010;35(2):109, 125. https://pubmed.ncbi.nlm.nih.gov/20595939/
  8. Serefoglu EC, McMahon CG, Waldinger MD, et al. An evidence-based unified definition of lifelong and acquired premature ejaculation: report of the Second International Society for Sexual Medicine Ad Hoc Committee. J Sex Med. 2014;11(6):1423, 1441. https://pubmed.ncbi.nlm.nih.gov/24848805/
  9. Althof SE. Psychological treatment strategies for premature ejaculation. World J Urol. 2005;23(2):89, 92. https://pubmed.ncbi.nlm.nih.gov/15924228/
  10. Serefoglu EC, McMahon CG, Waldinger MD, et al. ISSM 2014 guideline: lifelong and acquired premature ejaculation. J Sex Med. 2014;11(6):1423, 1441. https://pubmed.ncbi.nlm.nih.gov/24848805/
  11. Waldinger MD, Hengeveld MW, Zwinderman AH, Olivier B. Effect of SSRI antidepressants on ejaculation: a double-blind, randomized, placebo-controlled study with fluoxetine, fluvoxamine, paroxetine, and sertraline. J Clin Psychopharmacol. 1998;18(4):274, 281. https://pubmed.ncbi.nlm.nih.gov/9690692/
  12. Perelman MA. Delayed ejaculation. J Sex Med. 2013;10(4):1189, 1190. https://pubmed.ncbi.nlm.nih.gov/23551560/
  13. Barlow DH. Causes of sexual dysfunction: the role of anxiety and cognitive interference. J Consult Clin Psychol. 1986;54(2):140, 148. https://pubmed.ncbi.nlm.nih.gov/3700800/
  14. Serretti A, Chiesa A. Treatment-emergent sexual dysfunction related to antidepressants: a meta-analysis. J Clin Psychopharmacol. 2009;29(3):259, 266. https://pubmed.ncbi.nlm.nih.gov/19440080/
  15. Corona G, Isidori AM, Buvat J, et al. Testosterone supplementation and sexual function: a meta-analysis study. J Sex Med. 2014;11(6):1577, 1592. https://pubmed.ncbi.nlm.nih.gov/24629079/
  16. Mulhall JP, Trost LW, Brannigan RE, et al. Evaluation and management of testosterone deficiency: AUA guideline. J Urol. 2018;200(2):423, 432. https://pubmed.ncbi.nlm.nih.gov/29601923/
  17. Melmed S, Casanueva FF, Hoffman AR, et al. Diagnosis and treatment of hyperprolactinemia: an Endocrine Society clinical practice guideline. J Clin Endocrinol Metab. 2011;96(2):273, 288. https://pubmed.ncbi.nlm.nih.gov/21296991/
  18. Frühauf S, Gerger H, Schmidt HM, et al. Efficacy of psychological interventions for sexual dysfunction: a systematic review and meta-analysis. Arch Sex Behav. 2013;42(6):915, 933. https://pubmed.ncbi.nlm.nih.gov/23559892/
  19. Bossio JA, Basson R, Driscoll M, et al. Mindfulness-based group therapy for men with situational erectile dysfunction: a mixed-methods feasibility analysis. J Sex Med. 2018;15(10):1478, 1490. https://pubmed.ncbi.nlm.nih.gov/30197211/
  20. Twohig MP, Crosby JM. Acceptance and commitment therapy as a treatment for problematic internet pornography viewing. Behav Ther. 2010;41(3):285, 295. https://pubmed.ncbi.nlm.nih.gov/20569778/
  21. Goldstein I, Lue TF, Padma-Nathan H, et al. Oral sildenafil in the treatment of erectile dysfunction. N Engl J Med. 1998;338(20):1397, 1404. https://www.nejm.org/doi/10.1056/NEJM199805143382001
  22. Banner LL, Anderson RU. Integrated sildenafil and cognitive-behavior sex therapy for psychogenic erectile dysfunction: a pilot study. J Sex Med. 2007;4(4):1117, 1125. https://pubmed.ncbi.nlm.nih.gov/17451488/
  23. Atikeler MK, Gecit I, Senol FA. Optimum usage of prilocaine-lidocaine cream in premature ejaculation. Andrologia. 2002;34(6):356, 359. https://pubmed.ncbi.nlm.nih.gov/12472603/
  24. Kostis JB, Jackson G, Rosen R, et al. Sexual dysfunction and cardiac risk (the Second Princeton Consensus Conference). Am J Cardiol. 2005;96(2):313, 321. https://pubmed.ncbi.nlm.nih.gov/16018863/
  25. Bacon CG, Mittleman MA, Kawachi I, et al. Sexual function in men older than 50 years of age: results from the Health Professionals Follow-Up Study. Ann Intern Med. 2003;139(3):161, 168. https://pubmed.ncbi.nlm.nih.gov/12899583/
  26. Emanuele MA, Emanuele NV. Alcohol's effects on male reproduction. Alcohol Health Res World. 1998;22(3):195, 201. https://pubmed.ncbi.nlm.nih.gov/15706796/
  27. Pizzol D, Demurtas J, Stubbs B, et al. Relationship between cannabis use and erectile dysfunction: a systematic review and meta-analysis. Am J Mens Health. 2019;13(6):1557988319892464. https://pubmed.ncbi.nlm.nih.gov/31795808/
  28. Leproult R, Van Cauter E. Effect of 1 week of sleep restriction on testosterone levels in young healthy men. JAMA. 2011;305(21):2173, 2174. https://pubmed.ncbi.nlm.nih.gov/21632481/
  29. Park BY, Wilson G, Berger J, et al. Is internet pornography causing sexual dysfunctions? A review with clinical reports. Behav Sci. 2016;6(3):17. [https://pubmed.ncbi.nlm.nih.gov/27527226/](https://pubmed