What's up with the alien abductions?! Am I asking for trouble?

Your house looks so cool!
I don't know, I haven't had an abduction in (real) years. I'm not sure what triggers them apart from that object you can make as a scientist.
Also, the only thing that can happen to him is that he comes back pregnant with a baby alien in which case when the baby is born you can keep it or sending it back to its planet. Don't worry about your sim dying because of the abductions though. He will always come back.