Sargus isn't technically incorrect, the default template for a fetus is female, which is why men have nipples.
" @Sargus: What utter nonsense. If men have nipples simply because their mothers do, then why should they not also develop breasts or ovaries? While one could explain male nipples without evolution (though not with evidence, obviously), the set-up you've offered is patently absurd. The distinction between micro- and macro-evolution is also ridiculous, but I don't intend to argue that point so much as correct your apologetics. The creationist position is generally that it was each "kind" required. You have it backwards, as there are far more species than "kinds." Also, two of each is pretty inaccurate. Fourteen was the required number for any clean animal. Granted, I consider it all a load of bollocks, but if you want to offer the Judeo-Christian spin, it helps to have read the damned book. "
The split occurs a few weeks into fetal development, when the fetus begins developing the sexual organs, which is why men do not have ovaries.