I used to have a fetish for like....really skinny boy arms where veins/muscles were apparent. Not buff muscles, but just ones you could see because of a lack of body fat. I always thought ridiculously skinny/tall boys were the most attractive, but I think really skinny girls are gross looking. That always seemed odd to me. Mostly I was just obsessed, I think, with the body and muscles and how joints articulated and things. Probably why I loved A&P so much. Finding out about how everything worked was incredibly fascinating and played into my..hem...other interests.