It's also a false observation that abortion is a men v. women issue. It isn't and never has been. Women have always been the backbone of the pro-life movement. In fact probably most women who get involved in politics from the conservative side do so because of abortion.
The real divide (to the extent that there is one) is marital status and issues surrounding marital status. If you want to bang dudes you don't really know and not get stuck being a single mom (since you know the guys are only banging you because they're horny, not because they love you and therefore wouldn't marry you if they impregnate you), you're probably pro-abortion. If you're one of these guys, you're probably pro-abortion, because though the chick you're banging can't force you to marry her, she can force you to pay child support or blow your cover if she's a mistress.
Obviously, there are exceptions in all directions. There are married people who are pro-abortion, and there are single people who are pro-life, but to the extent that there is a divide, this is it.