"While, on the whole, there isn’t a major difference in the sexes’ attitudes toward abortion, there is one when we separate men and women by ideology. If we look at the data since 2000 (to get a more contemporary perspective), on the liberal end of the ideological spectrum men are consistently less supportive of abortion on demand than women. On the conservative end of the spectrum, it’s women who like abortion on demand less than men do. 

In other words, conservative women are the most anti-abortion segment of the population, and liberal women are the most in favor of abortion rights. You might say that the more significant difference here is not between men and women, but among women."

Razib Khan