Well, it really isn't just you - there are even scientific studies on this. Like for example:
Hybristophilia - "a paraphilia in which sexual arousal, facilitation, and attainment of orgasm are responsive to and contingent upon being with a partner known to have committed an outrage, cheating, lying, known infidelities, or crime—such as rape or m...... 1 reply
Fictional? Gimme a psychopath/serial killer. But there definitely needs to be more to them, they do need some layers and good reasons for being this way. Also, I don't think it's the killing that makes them so attractive, but rather the confidence and power that often comes with it.
My personal favorite will always and forever be Klaus from The Or...... reply