Sexual harassment/statutory rape in the workplace and the recipient being into it.

That was a creepy one that popped up for me in a previous fandom. I'd be horrified to actually be involved in a situation like that, but abuse of power actually turning the recipient on with shame was a big one of those oh no, why do I like that moments.

Also xeno. Never thought I'd be into xeno.

Both of those came from the Tron fandom, and just never really left.