when you make a alien sim everything's still the same including what happens when they want to make a baby and the alien men can only get pregnant when abducted the only thing different from anotha sim and an alien that you are playing is the color of their skin, i have no clue who gets them pregnan once they abducted i dont think its meant to go that far in our minds i think they just made it so that the men only get pregnant when they are abducted do that they'll have something different and weird in the game cause the whole concept of getting abducted is different and weird, just in case you were wondering
lol yeah, i think i'd just been playing far too long and over thought it.