Can You Ejaculate With Kidney Stones?

Kidney stones do not block ejaculation. The urinary tract and the ejaculatory pathway share some anatomy at the very end, but a stone lodged in the kidney or ureter sits well upstream of the structures involved in ejaculation. In fact, several clinical studies have found that ejaculation may actually help small stones pass faster. The real barriers to sexual activity during a stone episode are pain, medications prescribed for the stone, and any stents placed after treatment.

Why a Kidney Stone Does Not Prevent Ejaculation

A common worry is that a stone physically blocks the same tube semen travels through. It doesn’t. Urine flows from the kidney down the ureter into the bladder, then exits through the urethra. Semen, on the other hand, is assembled from the seminal vesicles and prostate, enters the urethra near the base of the bladder, and is propelled outward during ejaculation. During that process, the bladder neck closes off so semen moves forward rather than backward into the bladder. A kidney stone sitting in the kidney or ureter is entirely upstream of this junction and has no physical contact with the ejaculatory ducts or the seminal pathway.

Even when a stone has traveled down into the lower ureter near the bladder, it still occupies the urinary channel, not the ejaculatory duct. The two systems merge only briefly at the urethra, and by the time a stone reaches the bladder or the very end of the ureter, ejaculation mechanics are not disrupted. You can ejaculate normally from a plumbing standpoint. Whether you feel up to it is a separate question.

Pain as the Real Barrier

The reason most people wonder about sex during a stone episode is not anatomy but agony. Renal colic, the intense flank and abdominal pain that occurs when a stone moves through the ureter, can be severe enough to make any physical activity unthinkable. The pain often radiates into the groin, lower abdomen, and genital area, which understandably makes sexual activity unappealing or seem risky.

A large study tracking pain after ureteroscopy (a common stone-removal procedure) found that genital pain was common in both men and women and peaked the day after surgery. Participants whose stone was in the ureter rather than the kidney were more likely to report intense pain in the pubic region and burning during urination.¹ This kind of discomfort, whether from the stone itself or from a procedure to remove it, is the primary reason ejaculation might not happen during a stone episode. There is no structural danger in trying if the pain is manageable, but most people simply don’t want to.

Ejaculation May Actually Help Pass a Stone

Here is where the science gets genuinely surprising. Rather than being something to avoid, sexual activity and ejaculation have been studied as a way to speed up stone passage, and the results are striking.

A prospective controlled trial assigned patients with small distal ureteral stones (6 mm or smaller) to one of three groups: regular sexual intercourse three to four times a week, tamsulosin (a medication commonly prescribed to help stones pass), or standard care with no additional treatment. After two weeks, about 84% of the sexual intercourse group had passed their stones, compared with roughly 48% of the tamsulosin group and about 35% of the standard care group. The average time to stone passage was around 10 days in the intercourse group versus about 17 to 18 days in the other groups.² Those are large differences, and the study concluded that patients with small distal stones and a sexual partner could be advised to have intercourse several times a week to improve their chances of passing the stone spontaneously.

A separate trial looked specifically at masturbation rather than partnered sex, asking whether ejaculation alone (without intercourse) produced similar benefits. It did. Patients who masturbated at least three to four times per week had a spontaneous stone passage rate of about 81%, which was essentially the same as the tamsulosin group (around 81%) and far higher than the standard care group (about 43%). The study concluded that masturbation was as effective as tamsulosin for stones in the distal ureter between 5 and 10 mm.³

A meta-analysis pooling data from available trials confirmed the pattern: sexual intercourse three to four times weekly increased stone expulsion rates at both two and four weeks and reduced the need for pain medication compared with standard care.⁴ So ejaculation during a kidney stone episode is not just safe; for the right type of stone, it appears to be actively helpful.

Why Ejaculation Helps Stones Pass

The leading explanation involves nitric oxide, a molecule your body releases in large amounts during sexual arousal and orgasm. Nitric oxide is best known for its role in erections, but it also relaxes smooth muscle throughout the body, including the smooth muscle lining the ureter. When the ureter relaxes, it widens slightly, and a small stone that was stuck may be able to slip through. Researchers have noted that the nitric oxide released during sex inhibits ureteral muscle tone and the rhythmic contractions of the ureter, which reduces pain and makes it easier for a stone to move downward.⁴

There are probably other contributing factors too. Orgasm triggers rhythmic contractions of the pelvic floor and surrounding muscles, which could physically jostle a stone closer to the bladder. Post-orgasm, many people also urinate, and increased urine flow helps flush the stone the rest of the way out. The combination of smooth-muscle relaxation, pelvic contractions, and post-coital urination likely works together, though the nitric oxide pathway is the most studied piece.

One important caveat: these studies focused on distal ureteral stones, meaning stones that have already traveled most of the way down the ureter and are near the bladder. Stones still lodged high in the kidney or upper ureter have a much longer distance to travel, and there is no evidence that ejaculation helps with those. The mechanism makes sense only when the stone is already close to the exit.

How Stone Medications Affect Ejaculation

If a kidney stone doesn’t interfere with ejaculation, the medication you are prescribed for it might. Tamsulosin (sold under the brand name Flomax and generics) is the most commonly prescribed alpha-blocker for helping stones pass. It works by relaxing the smooth muscle around the ureter and bladder neck. That same relaxation, though, can prevent the bladder neck from closing properly during orgasm, which means semen flows backward into the bladder instead of forward out of the penis. This is called retrograde ejaculation, and it is one of the most frequently reported side effects of tamsulosin.

An analysis of the FDA’s adverse event reporting database confirmed that ejaculatory disorders, including retrograde ejaculation and complete absence of ejaculation, are a known class effect of alpha-blockers and are particularly common with tamsulosin.⁵ Retrograde ejaculation is not dangerous, and it resolves once you stop taking the medication, but it can be alarming if you are not expecting it. You still have an orgasm, but little or no semen comes out. If you notice cloudy urine after orgasm while on tamsulosin, that is the semen going the wrong direction.

Other medications used during a stone episode, such as anti-inflammatories and opioid painkillers, can also dampen sexual desire or make it harder to achieve orgasm, though these effects are less specific and vary widely from person to person.

Ureteral Stents and Sexual Function After Treatment

For stones that require surgical removal, a temporary ureteral stent (a thin tube left inside the ureter to keep it open while swelling goes down) is sometimes placed. Stents are notorious for causing discomfort, urgency, and a general feeling of irritation in the bladder and groin. They also affect sexual function more directly than the stone itself ever did.

A controlled study of men who underwent ureteroscopy with stent placement found that erectile function, ejaculatory function, and overall quality of life all worsened after surgery and stenting. The effect was most pronounced in the first few weeks and gradually improved, but could persist for at least three months. The study recommended that stenting be avoided when possible and that when stents are necessary, they should be left in place for as short a time as feasible. Patients should be told upfront that temporary sexual dysfunction is a likely consequence.⁶

The good news is that these effects are temporary. Once the stent is removed, sexual function typically returns to baseline. But during the weeks the stent is in place, many men report reduced erections, discomfort with ejaculation, or reduced desire. If you have a stent and are wondering why things feel off, this is a well-documented and reversible phenomenon.

Long-Term Sexual Health in Recurrent Stone Formers

A single kidney stone episode is unlikely to leave any lasting mark on your sexual function. But recurrent stones, the kind that come back repeatedly over years, tell a slightly different story. A multicenter cross-sectional study of kidney stone formers found that men who had experienced more frequent stone episodes had progressively worse erectile function. Those with two to five lifetime stone events, six to ten events, and more than ten events all showed meaningfully worse erectile scores compared with men who had only had one episode.⁷

Ejaculatory function, on the other hand, was relatively well preserved even in recurrent stone formers. Men in the study scored well on ejaculatory function measures, and both men and women reported good sexual satisfaction overall with low sexual distress. So the main concern with repeated stones is erectile function rather than ejaculation specifically. Whether this is a direct effect of the stones and their treatment, or a reflection of shared risk factors like obesity, metabolic syndrome, and cardiovascular disease that predispose people to both stones and erectile problems, is still being worked out. Likely it is some of both.

When to Be Concerned About Painful Ejaculation

Kidney stones in the ureter or kidney should not cause pain during ejaculation itself. If you are experiencing painful ejaculation, the cause is more likely related to infection, inflammation, or, rarely, stones in an unusual location. Seminal vesicle stones, for instance, are an uncommon condition in which calcium deposits form inside the seminal vesicles rather than the urinary tract. A case report described a 29-year-old man with bilateral seminal vesicle stones who presented with recurrent urinary tract infections and painful ejaculation.⁸ This is quite rare, but it illustrates that stones can sometimes show up in places beyond the kidneys and ureters.

Prostatitis, urinary tract infections, and sexually transmitted infections are far more common explanations for painful ejaculation than any type of stone. If ejaculation is consistently painful, that warrants a visit to a urologist. A standard kidney stone, even a large one, does not sit in the anatomical path of semen and should not make orgasm hurt.

Practical Guidance During a Stone Episode

If you are actively passing a kidney stone and wondering whether sexual activity is safe, here is what the evidence supports:

Small distal stones: If your stone is in the lower ureter and is small (under about 10 mm), regular ejaculation through intercourse or masturbation several times a week may genuinely help it pass faster. This is backed by multiple controlled trials, not folk wisdom.
Larger or upper stones: There is no evidence that ejaculation helps pass stones still lodged in the kidney or upper ureter. It is not harmful, but do not expect the same benefit.
During acute pain: If you are in the middle of severe renal colic, sexual activity is impractical and there is no reason to force it. Wait until pain is manageable.
While on tamsulosin: Expect possible retrograde ejaculation. It looks like a “dry” orgasm, is harmless, and reverses when you stop the medication.
With a stent in place: Ejaculation may be uncomfortable or less satisfying. Function returns to normal after stent removal, usually within a few weeks.

None of these situations involve a risk of injury from ejaculation. There is no scenario in which orgasm makes a kidney stone worse, causes a stone to become stuck, or damages the urinary tract. The worst that happens is that it hurts more than usual, and even that is uncommon unless a stent is involved.

Fertility and Kidney Stones

A related concern some people have is whether kidney stones or their treatment affect fertility. Ejaculation during a stone episode delivers normal semen through normal pathways, so a single episode has no effect on sperm quality or quantity. Tamsulosin-induced retrograde ejaculation temporarily reduces the amount of semen exiting the body, which could theoretically reduce chances of conception during the weeks you are taking it, but this reverses as soon as the drug is discontinued.

Recurrent stones treated with repeated lithotripsy (shockwave treatment) have raised some theoretical concerns about damage to nearby tissues, including the testicle on the treated side, but evidence of lasting fertility harm from modern lithotripsy is thin. Ureteroscopy and stent placement, as noted earlier, temporarily disrupt function but do not cause permanent damage. For the vast majority of stone formers, fertility is not affected in any meaningful or lasting way. The larger fertility risk, if there is one, comes from the same metabolic conditions that cause recurrent stones rather than from the stones or their treatment directly.