i spent a year in paris and actually lived in the gay district while doing work for my degree. i used to get a few looks now and again. i also had one guy try and strike up a conversation about something or other and in the end i stopped walking and told him i wasn't gay but thanks, then he tells me 'you are looking very gay'. Well great, be sure to tell that to all the hot french women that won't give me the time of day!
I have also had an irish gay couple in england tell me that i was gay, like they just 'know' or something. I guess if you look approachable, athletic, and not that ugly some gay people presume you are that way inclined. I also have a little bit of a baby face, and look young for my age (22) which I guess doesn't help.
The reason I'm writing this is the experiences I have had with gay men presuming I am interested weren't always pleasant. The worst thing is the awkwardness when I'm aware of being eyed up and I'm not walking anywhere, like on a train. Gay guy shoots a look at me, I think fuck he thinks I'm gay, don't look at him,,,,train stops, have to get off at the same doors, gay guy is blatantly staring at me as I walk up feeling awkward as fuck. I guess I've not had any real experience dealing with it, so I don't know what to do, do i say 'GET BACK HOMO!' or just try and ignore him? When there's no conversation I just try to ignore it.
http://www.youtube.com/watch?v=wfw4uGwKEiY skip to 1:26