I had to cap my name because visits to the chat room garnered mashers assuming I was female and submissive. Capitalizing the "O" instantly fixed that.
The only problem with icons... is there aren't enough to describe all the variations. Male/female? what about the transgendered, gender-benders, and hermaphroditic? Dom/sub? You leave out switches, those who dominate all but one to whom they sub, the reverse, tops and bottoms who don't, per se dom or sub, and all sorts of kinksters who don't identify with a role at all.
This is like trying to encode ALL the various types into a single "handkerchief" code. LOL