"To explain this letter," writes a "Savage Love" reader/tipster, "a greywater recycling system is where you take shower and wash basin water, treat it, and use the treated water to flush your toilet. Recently a university that uses one of these systems ran into some problems. Filters clean the water before it is recycled and, well, university students were doing what university students do and the filters were getting clogged."
"Hopefully you found humor not just in the situation, but also in the fact that the university has asked thousands of male students to stop knocking one out in the shower. Yeah, fucking right."
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Semen is a product of multiple organs. The testes produce the actual spermatozoa but only account for a small fraction of semen. Something like 5% in volume. The bulk is produced by the seminal vesicles about 50%. Mostly, it adds fructose to the semen which is a sugar and provides the fuel needed by the spermatozoa for their epic journey to the ovum. But it also produces a protein that coagulates. I don't remember it's name right now and if I remember correctly it coagulates when in contact with a non-alkaline medium. Semen is alkaline to counter the acidity of the vagina.http://www.reddit.com/r/askscience/comme…
The reason for coagulation is so that semen remains in the female after the deed is done. If you've noticed, it becomes like a sticky jelly. Now you know why. But the thing is this jelly also traps the spermatozoa in it. So there is another mechanism to deal with that.
About 20% of semen volume is produced by the prostate gland. In it there is a coagulase enzyme called PSA. When they test your blood for prostate cancer, this is usually what they're looking for. The job of this enzyme is to break down that jelly like thing somewhere from 5 to 45 minutes after ejaculation. Then the semen becomes liquid again and the spermatozoa can go free on their journey. You can test this yourself... Or your girlfriend can do it for you :-P
I hope this answers your question.
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