Some gay men are masters at identifying and seducing straight-identified guys who aren't entirely straight. By the same token, some not-entirely-straight guys know how to send signals out to gay men they'd be willing to hook up with, but the burden is ulimately on the gay man to make it happen. If the straight guy has to work at it too hard...well, that kind of diminishes his straightness.
If a straight-identified guy seems to be flirting with me, I generally dismiss it as "he's just being friendly" while simultaneously engaging in all sorts of wishful thinking that he's really gay (if I'm attracted to him) and will one day realize his love for me. Even if it obvious that he is indeed flirting with me, the expectation on his part seems to be that I'm going to be the one who takes a chance and makes the first move. Sorry, buddy, put your cards on the table or bug off. I've got better things to do than play your games. By the way, how's your wife?
[Sigh] The truth is, I'm too damned insecure to take advantage of such opportunities when they arise. If a guy is interested in me, I need him to say so. I'm no good at the subtleties of flirting. Even when I know it's happening, I haven't a clue how to respond in kind, how to signal back, "Yes, I'll fuck you discretely and send you home to your wife with your straight identity intact and no one but us will ever know. I'll even service you regularly, if that's what you want, or it'll just be a one-time thing (whichever is less threatening to you). Either way, no strings attached."
Honesty and integrity are not conducive to getting laid.
Last night I watched a Bavarian film called
Summer Storm. One of the supporting characters is the type of gay guy who has a high success rate at seducing straight guys. There are a couple of scenes in the movie in which he's working on a particular straight guy, who is a bit homophobic, and it was amazing to watch the way he put the straight guy at ease and gradually gained his trust. I've known guys just like this. I don't really like how aggressive and manipulative they are, yet I'm envious of their ability to know just the right things to say, the way to say it, and their mastery of body language.
Here's a scene in which the gay guys mess with the head of a homophobic guy (starting at 6:18), which then leads into the first secution scene (starting at 8:17). It's in German, but watching the body language, you get the gist of what's going on.
http://www.youtube.com/watch?v=40XxHmrpbZY&feature=related
Here's another clip. The seduction scene begins at about 4:36 and ends at 6:22.
http://www.youtube.com/watch?v=n467S-7opw4&feature=related
Apparently, seducing straight guys involves touching your own chest a lot.
Sorry, I strayed off-topic.