I've been registered for some time on OKCupid, a dating site that's het/bi/gay friendly, and has a number of trans/genderqueer people on it.
I just changed my profile to say clearly that I'm (a) bi, (b) only looking for friends, and (c) transitioning MTF - and all of a sudden I'm getting lots of messages from 50-something straight women all over the country telling me "You look cute". People are weird!
Oh, and I wrote to OKCupid asking how to change my gender on my profile - and got no reply

.