I want my boyfriend's hand around my throat, and his cock in my ass. Or maybe he could take me from behind while pulling on a scarf around my throat. Either way, asphyxiation at his hand during sex is how I'd like it.
I think it was when I was about 13, and read about Carl Tanzler in one of my mom's magazines. I just thought the whole thing was so romantic.
I'm not sure how that progressed to actual sexual attraction, though.