After many MANY hours of playing and banging my head against my keyboard, my male sim finally got abducted, TWICE! The first time he was just chilling outside and all of a sudden, BAM, abduction! The second time, I had left my game on playing itself, went and took a shower, and when I came back he had the bad abduction moodlet. Right after that moodlet wore off he got the unexpected weight gain moodlet, and now I have a lovely alien baby girl. Hooray!