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Originally Posted by rofgilead
Basically, a gel is placed into the penis, which slows the ejaculation of sperm, but doesn't block ejaculation. This gel can later on be dissolved easily, reversing the contraceptive.
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Time for an anatomy lesson.
The gel is not placed in the penis. It's placed in the vas deferens, which is the tube connecting the testicle to the seminal vesicle. Sperm cells move through the vas deferens, where they meet up with the nutrients and fluids in the seminal vesicle, where the now-complete semen hangs out until it is ejaculated.
<img src="http://www.marinurology.com/articles/vasectomy/vas-images/vas-anatomy.jpg">
Blocking the vas deferens very cleverly eliminates the "active ingredient" if you will from semen, without otherwise disrupting its contents or production. Traditional vasectomy is a cutting or crimping of the vas deferens. So this is very much like a vasectomy, but more reversable.
I'm VERY excited about this. My good wife has borne (pardon me) the burden of our contraception for neigh on 15 years. I'm willing and ready to let her be hormone-and-implant free, and if something like this is as good as it seems... Sign me up!