Not really James Bond, just the allure of something different. Same reason people take more notice of an American in Italy. The important thing, I guess, is to come from somewhere 'interesting' to people.
Man do I love that word! It just rolls off the tongue.
Anyway, though, you know that most people are, in fact, hetero? Without having been given other information it he's got a ~90% chance of guessing right.
But feel free to comment on what it's like for a gay dude in the valley, that would be interesting.