It's not especially unusual for men to release semen when they aren't having a sexual climax. On the other hand, it's not entirely "normal" either.
Semen can be mixed with urine in very small amounts, or it can be very noticeable, most often when a man urinates after having sex or masturbating. Sometimes the semen floats like a lump in the urine. Sometimes urine seems unusually milky. And sometimes the "white stuff" in a man's urine isn't semen at all. Different conditions cause different kinds of white discharges.
Retrograde ejaculation is the most common cause of semen in urine in men who have diabetes or multiple sclerosis, and in men who produce unusually large amounts of semen. When ejaculation is retrograde, semen moves up to the bladder rather than out of the penis. The orgasm can be especially intense and long lasting, but there is no climax. The common term for this is "doing it dry," or dry orgasm. Semen mixes with urine in the bladder and there is cloudy or bubbly urine after the sex act, or sometimes after a "dry wet dream," a nocturnal emission with the climax but without the emission.
Retrograde ejaculation is caused by a weakness in the muscle the bladder uses to "hold it in" between urinations. Men can strengthen this muscle by interrupting their flow of urine when they need to go: After flow of urine has started, stop it for 5 seconds, then force it to move faster, then stop it for 5 seconds, and so on. Doing this for a few weeks usually strengthens the muscles around the sphincter of bladder that retrograde ejaculation stops. Retrograde ejaculation is not usually something your doctor will treat.
Another cause of semen in the urine is an enlarged prostate. Men who have this problem typically also have problems with not feeling they've finished when they urinate, having to go to the bathroom over and over again but releasing very little urine, and/or times they feel like they are going to bust before they can get to the bathroom and then just dribbling out a little.
The prostate makes the semen that conducts sperm to the egg. If you don't have a prostate, you don't make semen. If you have an inflamed prostate, you may have an accumulation of semen that can't wait to be released by sex, which comes out with the urine.
If you have an enlarged prostate, you probably need medical treatment. Sometimes following an anti-inflammatory diet (limited fat and sugar) or taking herbs like saw palmetto or plant sterols may help, but usually medical intervention is necessary to get results. It's important to understand, and an astonishing number of men do not, that removal of the prostate ends the production of semen permanently.
Not everything white in a man's urine is necessarily semen. Other possibilities include:
- White particles in the urine can be an early or late sign of kidney stones. They are present when stones either have already been passed or haven't formed yet. Either way, it's a good idea to see a doctor.
- Milky white urine every time you "go" can be a sign of a bladder infection. The immune system sends white blood cells to tackle the infection, and some of them get mixed with the urine. If you have a bladder infection, you are likely also to experience intense pain with urination and not even be thinking about sex. Sometimes unsweetened cranberry juice or cranberry juice extract tablets help with a urinary tract infection, but usually you will only get relief from antibiotics. In younger men, this often occurs after experimenting with anal sex. In older men, it often occurs with obesity pressing the tip of the penis against underwear soiled by feces.
- If you have traveled to the tropics and contracted a parasitic infection called filariasis, you may have white urine because the parasite ate a channel between your lymph glands and your urinary tract. Treating the parasite treats this symptom.
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