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Erections and Sex After Prostate Cancer Treatment

Written by David Shusterman, MD, board-certified urologist, adapted from his book Prostate Unlocked. General information, not medical advice for your situation. Who publishes this site.

Prostate cancer treatment can affect erections, ejaculation, orgasm and sexual confidence, but the effects differ a great deal by treatment. Radical prostatectomy ends normal ejaculation and carries a major risk of erectile dysfunction, even with nerve-sparing surgery. Recovery varies: some men recover well, others do not. Radiation tends to affect erections more gradually, over months or years, and hormone therapy can lower desire and erections while it is given. Active surveillance avoids these effects while the cancer is only being watched. Erection problems after treatment can often be helped with pills, vacuum devices, injections and other treatments.

The best time to talk about sex is before treatment, not after you are living with the result. Sexual function is part of health, and part of consent.

Erections do not come from the prostate

The prostate does not make erections. An erection depends on blood flowing into the penis and being held there, which requires healthy blood vessels, nerve signals, smooth-muscle relaxation, hormones and the brain. Heart health, diabetes, blood pressure, smoking, sleep, stress and medications all matter.

The problem is location. The nerves that control erections run very close to the prostate. The prostate also adds fluid to semen and sits in the middle of the pelvis with the bladder, pelvic floor muscles and the structures involved in ejaculation. So when the prostate is removed, irradiated or deprived of hormones, sexual function can change even though the prostate itself was never the source of the erection.

After radical prostatectomy

Surgery removes the whole prostate and the seminal vesicles. That means normal ejaculation is gone. The sensation of orgasm may remain, but no semen comes out because the organs that made the fluid have been removed. Men should know this before surgery, not discover it afterward.

Erections can be affected because the erection nerves may be stretched, bruised or partly injured during the operation, even when a nerve-sparing robotic technique is used. Recovery takes time. Some men recover well. Others do not. Penile length changes are also a known concern to discuss. Urinary leakage after surgery can undermine sexual confidence as well, and many men benefit from pelvic floor rehabilitation to recover urinary control.

After radiation and hormone therapy

Radiation affects sexual function in a different pattern. Erections may decline gradually. Some men keep good function for years, while others notice worsening months or years after treatment. Age, baseline erections, diabetes, vascular health, smoking, radiation dose and whether hormone therapy is added all influence the outcome. Semen volume may decrease and orgasm may feel different. Urinary or bowel symptoms after radiation can also affect intimacy.

When hormone therapy (androgen deprivation) is given with radiation, sexual function is often affected more significantly during treatment. Lowering testosterone signaling can reduce libido, erections, energy, mood and muscle. Ask how long hormone therapy is planned and how its side effects will be handled.

Active surveillance and focal therapy

For men with low-risk cancer, active surveillance is the option most likely to protect sexual function, because the cancer is monitored rather than treated unless it changes. That is one of the main reasons it exists.

Focal therapy treats only the cancerous area and is designed to reduce damage to the structures involved in erections, ejaculation and continence. Its functional promise is appealing, but it is still being studied against established treatments, and some men have urinary or pelvic symptoms afterward depending on the treated zone. See prostate cancer treatment options for how these choices compare.

Getting erections back

Erection problems after treatment are common and should not be a source of shame. There are real options:

• PDE5 inhibitor pills such as tadalafil or sildenafil, often used as part of penile rehabilitation after surgery, and helpful for some men with gradual changes after radiation.
• Vacuum devices, which draw blood into the penis mechanically.
• Penile injections, which work directly on the erectile tissue.
• Other treatments when these are not enough.

Pills work best when the erectile system can still respond. If nerve injury is severe, vascular disease is advanced, testosterone is low or diabetes or pelvic damage is significant, pills may not be enough, and that is not a personal failure. Tadalafil must never be combined with nitrate medicines, because the combination can cause a dangerous drop in blood pressure. Men with significant heart disease need medical review first.

Confidence, fertility and testosterone

Confidence is part of sexual function. A man can have adequate erections and still have a smaller sex life because he worries about leakage, is tired or no longer trusts his body. Say what you are avoiding and what you want to feel comfortable doing again. If you want a partner involved, bring them into the conversation. It is also fine to speak privately with your clinician first.

Fertility. Sexual function and fertility are not the same thing. Prostatectomy ends ejaculation, and other treatments can affect semen. If children may still be in your future, raise it early, because sperm banking may be considered before certain treatments.

Testosterone. Testosterone therapy after prostate cancer is an individualized specialist decision. After definitive treatment of localized cancer, some specialists consider it for selected men with symptomatic deficiency and a stable PSA, though long-term evidence is limited. In metastatic prostate cancer it is generally contraindicated. Do not start testosterone without the clinician managing your cancer.

What to ask before treatment

You do not need every technical detail. You need to know what may change in your life. Before deciding, ask:

• How might this treatment affect my erections, and over what time frame?
• Will I still ejaculate? Will orgasm feel different?
• What is my risk of urinary leakage, and how is it treated?
• Will hormone therapy be part of the plan, and for how long?
• What penile rehabilitation do you recommend, and when does it start?
• If fertility matters to me, what should I do before treatment?

Men in their sixties, seventies and eighties may care deeply about sexual function, and no doctor should assume otherwise. Some value ejaculation, others do not. The point is to decide with information, not assumptions. If sexual side effects are part of your treatment decision, or you are struggling after treatment, talk to a urologist.

Frequently asked questions

Can I still have an orgasm after prostate removal?

Often yes. The sensation of orgasm may remain, but no semen comes out because the prostate and seminal vesicles have been removed.

Does nerve-sparing surgery prevent erectile dysfunction?

It does not guarantee it. Even with nerve-sparing robotic surgery, erectile dysfunction is a major risk, and recovery can take time.

Does radiation cause erectile dysfunction?

It can. Erections may decline gradually over months or years. Baseline function, age, diabetes, vascular health and added hormone therapy all affect the risk.

What helps erections after prostate cancer treatment?

Options include PDE5 inhibitor pills such as tadalafil or sildenafil, vacuum devices, penile injections and other treatments when those are not enough.

Can I take testosterone after prostate cancer?

Only as an individualized specialist decision. Some specialists consider it for selected men after definitive treatment with stable follow-up; in metastatic disease it is generally contraindicated.