So why hasn't there been a push for male birth control sooner? I am going to be cynical and say I think it is because unintended pregnancy hasn't hurt men enough to be bothered until now, and that society doesn't care about the side effects birth control have in women, because they should count themselves lucky to have a choice. This has changed, though, and the push is on.
Currently, men have two birth control options: Vasectomy, and condoms. One of these is a little too reliable, and one of them isn't reliable enough. There are no really good options for men who do want children, but not right now (and men who want vasectomies so they never have children are struggling to get them). Drug companies claim they are close to having a birth control pill for men, but realistically this is probably still a good five years off by the time FDA testing and all that crap has been done. Even then, I think men are probably less likely to remember to take a pill, and men are already bitching about side effects they might get having seen what happens to women. What I can't understand is why hormones are the option being most closely investigated. It seems to me that the best option would be a reversible method of blocking the vas deferens, but then I guess no-one can make enough money off that.
Whatever the end result is, now that men actually want reversible, reliable birth control, I think we can expect to see it, and has got to be a good thing for everyone.