Somebody who only washes their hands when there is somebody else present in the bathroom. This person would even go as far as to tear off a paper towl and pretend to dry their hands while exiting a public restroom.
The curious way that characters in Harry Potter Fanfiction can be not gay but still in love with a man, in popular practice this is a way to explain how Harry Potter has never been attracted to a man before and not really many women and is still attracted to Severus Snape. Also Severus Snape fans claim this title.
Harry: I'm sorry I've never fucked another guy, but I've never liked another guy....maybe I'm Snapesexual?
Snape: *Raises eyebrow*