And there's something philosophically weird about placing something that in reality only women can do and men cannot physically accomplish into the male domain.

Yes. That's one of my issues with MPreg as well. Among many others. But I am not a slasher, and I like women in my fic, I like them to have sex- with both men and with each other - and kick ass, so...

I don't read MPreg unless it's parody, and even then I have a low tolerance for it.