Though I was a bit confused why only males could get pregnant from aliens by default, but I think it's because, ORIGINALLY, only females could get pregnant the normal way, so they did that to balance it I guess.
You could go around punching people in the face or kicking them in the crotch-and in true Sims spirit you could do it to anyone, regardless of gender, which is how it should be, since the sims has been known for its total equality and I love it for that. That's the guy that did a similar mod in TS3, right? Violence and Aggression or something? Did he ever say anything about porting/remaking it for TS4? I loved some of the interactions.