Something I like that's unconventional yet not really taboo is pregnancy.
I like the idea of having had sex with a pretty girl and then doing it again when she's carrying my child. I'm not sure exactly why, but I suppose it's something built into people naturally? The pregnant physique is just very appealing to me, yet a similar physique from overeating is something I don't like at all. It's very strange.
I remember seeing this format before, but with Jibril from NGNL: