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Good question. Speaking from a purely chemical standpoint, spermatogenesis should be something that can be controlled/controllable with a pill or other ingestable chemical. It is a relatively simple process that is often affected by something as simple as tight underwear, hot tubs, or riding a bike alot.
The female hormone cycle involves not just one but several hormones acting in a cascade and cycle that requires an orchestration that, when fiddled with, plays havoc with other systems in the female. The pill decreases sexual drive (ironic), increases blood pressure and the risk of cardiovascular problems.
The problem will male contraception is, in the past, THEY have offered male birth control with a scalpel or a needle and that usually has sent men running the other way (funny, that).
You have peaked my curiousity on the subject. I'm going to check out some research in the area and perhaps "report" back on what I find...
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