Some references are below:
Here is the article: http://www.dcnutrition.com/Problems/Det ... Number=226
and here is the relevant part:
.2. Avoid intense sexual excitement without a natural conclusion of ejaculation. Continued excitement without ejaculation causes engorgement of the gland and if this continues it can lead to structural and functional damage. Develop regularity in sexual habits if possible
Another one:
http://www.straightdope.com/columns/rea ... ic-arousal
When not in a state of sexual excitement, a normal male's prostate will cook up about one-tenth to four-tenths of a teaspoon of prostatic fluid a day. This ordinarily drains into the urinary tract and gets excreted. During periods of sexual arousal, however, the prostate kicks into overdrive, churning out 4 to 10 times as much fluid as usual — far too much, some say, to pass into the urine quickly. If the man fails to have an orgasm, the stuff backs up in the prostate and causes congestion. In younger men this is often characterized by pain in the pelvic area and painful and swollen testicles. The usual treatment is continence, perhaps accompanied by ice-packs and/or an anti-inflammatory drug.
In severe cases the congestion can block the urinary tract, which passes through the prostate, meaning you can't relieve yourself and you fill up like a water balloon. Symptoms may include pain in the lower back or rectum (the prostate is located next to the rectal wall), burning sensation during urination, unusually frequent urge to urinate, and sometimes pain and minor bleeding after ejaculation.
