Enlarged Prostate and Sex: How BPH Affects Sexual Function — and What You Can Do

What is BPH and why does it affect sex?

The prostate is a walnut-sized gland that sits just below the bladder and surrounds the urethra — the tube carrying urine and semen out of the body. BPH is a common, non-cancerous prostate enlargement that occurs in many men with age 1Ref 1Lerner LB, McVary KT, Barry MJ, et al. (2021).Management of Lower Urinary Tract Symptoms Attributed to Benign Prostatic Hyperplasia: AUA Guideline Part I — Initial Work-up and Medical Management.BPH pathophysiology and ejaculatory effects; alpha-blocker and 5-ARI sexual side effects; tadalafil's dual indication for BPH and ED. As the prostate grows, it presses on the urethra and bladder, causing familiar urinary symptoms — frequent urination, a weak stream, waking at night, a sense of incomplete emptying.

These same anatomical relationships explain the overlap with sexual function. The prostate participates directly in ejaculation, so changes in prostate size and pressure affect what happens during sex.

How does BPH affect ejaculation?

Ejaculatory problems are the most directly linked sexual effect of BPH itself 1Ref 1Lerner LB, McVary KT, Barry MJ, et al. (2021).Management of Lower Urinary Tract Symptoms Attributed to Benign Prostatic Hyperplasia: AUA Guideline Part I — Initial Work-up and Medical Management.BPH pathophysiology and ejaculatory effects; alpha-blocker and 5-ARI sexual side effects; tadalafil's dual indication for BPH and ED. An enlarged prostate can cause: - Decreased ejaculate volume or force — the enlarged gland alters the mechanics of ejaculation - Painful or uncomfortable ejaculation (dysejaculation) — thought to relate to pressure or spasm in the prostate and seminal vesicles - Retrograde ejaculation — semen enters the bladder instead of exiting through the urethra; orgasm still occurs but little or no semen appears; the semen is passed harmlessly later in urine

Men with significant lower urinary tract symptoms from BPH are more likely to report ejaculatory dysfunction than men without these symptoms.

Does BPH directly cause erectile dysfunction?

BPH and erectile dysfunction (ED) often coexist in the same man, but not because one directly causes the other 1Ref 1Lerner LB, McVary KT, Barry MJ, et al. (2021).Management of Lower Urinary Tract Symptoms Attributed to Benign Prostatic Hyperplasia: AUA Guideline Part I — Initial Work-up and Medical Management.BPH pathophysiology and ejaculatory effects; alpha-blocker and 5-ARI sexual side effects; tadalafil's dual indication for BPH and ED2Ref 2Burnett AL, Nehra A, Breau RH, Culkin DJ, Faraday MM, Hakim LS, Heidelbaugh J, Khera M, McVary KT, Miner MM, Nelson CJ, Sadeghi-Nejad H, Seftel AD, Shindel AW (2018).Erectile Dysfunction: AUA Guideline.Shared risk factors for BPH and ED; tadalafil as treatment for both conditions; cardiovascular evaluation considerations. Both become more common with age, obesity, cardiovascular disease, diabetes, physical inactivity, and metabolic syndrome. There is also evidence that the chronic inflammation associated with BPH, and the sleep disruption caused by nighttime urination, can contribute to ED through shared pathways.

It is an oversimplification to say BPH causes ED directly — the relationship is more about shared territory than direct cause and effect. Treating the urinary symptoms (for example, improving sleep by reducing nocturia) can sometimes improve sexual function indirectly.

How do BPH medications affect sexual function?

This is where many men are surprised. Common BPH medications have sexual side effects that can be more prominent than the disease itself 1Ref 1Lerner LB, McVary KT, Barry MJ, et al. (2021).Management of Lower Urinary Tract Symptoms Attributed to Benign Prostatic Hyperplasia: AUA Guideline Part I — Initial Work-up and Medical Management.BPH pathophysiology and ejaculatory effects; alpha-blocker and 5-ARI sexual side effects; tadalafil's dual indication for BPH and ED.

Alpha-blockers (tamsulosin, alfuzosin, silodosin) relax muscles in the prostate and bladder neck to improve urine flow. They frequently cause ejaculatory dysfunction — particularly retrograde ejaculation, which is most pronounced with silodosin. This is not harmful but can be unexpected and is a concern for men wanting to preserve fertility.

5-alpha reductase inhibitors (finasteride, dutasteride) shrink the prostate over time by blocking conversion of testosterone to its more potent form (DHT). These medications can cause decreased libido, erectile dysfunction, reduced ejaculate volume, and — less commonly — persistent sexual side effects that some men report even after stopping the medication 3Ref 3Mella JM, Perret MC, Manzotti M, Catalano HN, Guyatt G (2010).Efficacy and safety of finasteride therapy for androgenetic alopecia: a systematic review.Sexual side effects of finasteride including decreased libido, ED, and reduced ejaculate volume — the same pharmacology applies to finasteride used for BPH. Men should understand these possibilities before starting.

Tadalafil (Cialis) is approved for both BPH symptoms and ED 1Ref 1Lerner LB, McVary KT, Barry MJ, et al. (2021).Management of Lower Urinary Tract Symptoms Attributed to Benign Prostatic Hyperplasia: AUA Guideline Part I — Initial Work-up and Medical Management.BPH pathophysiology and ejaculatory effects; alpha-blocker and 5-ARI sexual side effects; tadalafil's dual indication for BPH and ED2Ref 2Burnett AL, Nehra A, Breau RH, Culkin DJ, Faraday MM, Hakim LS, Heidelbaugh J, Khera M, McVary KT, Miner MM, Nelson CJ, Sadeghi-Nejad H, Seftel AD, Shindel AW (2018).Erectile Dysfunction: AUA Guideline.Shared risk factors for BPH and ED; tadalafil as treatment for both conditions; cardiovascular evaluation considerations. For men dealing with both conditions, it is often a useful single-agent option that addresses urinary symptoms while potentially also helping with erections.

How do I have this conversation with my clinician?

Sexual function is often under-discussed in the context of BPH management — partly because urinary symptoms dominate the clinical picture, and partly because some men feel reluctant to raise it. Both the condition and its treatments can affect your sex life in ways that matter for quality of life. This is a legitimate part of the clinical conversation, not an afterthought.

Tell your clinician specifically what matters to you: if fertility is a concern, if ejaculation has become painful or absent, if erections have changed, or if you would prefer a treatment approach with fewer sexual side effects. These details guide the choice of medication — or whether a non-medication approach is the better fit.