Does anyone / has anyone here ever found themselves attracted to someone who most others would likely view as borderline unattractive, but you for some reason still really want to f*k them?

Does anyone know why we feel this way towards certain people? Has anyone gone through with sleeping with that person?

Edit: Disclaimer - this is not just a matter of feeling horny and wanting to sleep with someone / anyone. Even when not feeling horny, you would still find them really attractive.