Because of the many complaints about alien abductions, my male sims very rarely get pregnant by abduction.
I have had three abductions happen to Don, but no impregnation yet which is disappointing. I thought it might help if I saved the game just before the negative abduction moodlet wore off - then I could reload and re-roll his chance of becoming pregnant. But no such luck. That is, I gave up after several attempts.
(Knew, too, you were kidding)
The only thing about vampires I would like to be toned down is their animation in CAS mode. Every time I click something, they hiss and move and take forever to stand still again. A-nnoying.