I don't have Life and Death, but it's been a big problem. One of my male Sims had I think 3 alien babies, I don't want to play with aliens. Babies don't work with my storylines right now. I had to download the satellite disk from the gallery to get things under control with 3 of my households that were having too many abductions. I've had to send them back to the home world. Like I said before, they need to put a toggle in for alien abductions so those of us who don't want alien pregnancies don't have to deal with it. Locking the families in at night seems to help too, if no one can get outside the aliens can't get them. I don't have problem having aliens around, I just don't like my sims being abducted constantly.