It's one of the oldest cliches in the book, that somehow having sex with a man makes you less 'manly' and less attractive to women. But actually the opposite is often true, and society is finally catching on. I'm a bisexual man. I've had sex with men, women and long lasting relationships with both. Personally, I have no preference. If I find someone entertaining or sexy I'll go for it, we'll work out what's going on in the bedroom when we get there.
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Or maybe he just likes to pretend that he does. Most guys in the world are straight. If you like men, it's only a matter of time until you're going to find a straight one attractive; they're all over the place. Under most circumstances, this doesn't have to be a big deal. You see a guy you like, you realize quickly enough that he's straight, and you move on. Some of us might not want to give up so easily, however. Though it's probably not the best idea, some people let their feelings take over, and they become infatuated with a specific straight guy.
Does not wanting to date a bisexual man make you a bad person?
Pay attention to body language. The way that a guy holds himself and behaves around you may give you your first sign that he is interested in you. When people are attracted to each other, they tend to face each other, lean in close or stand close, and do subtle things like:  Smiling and making eye contact. This is the classic sign of interest. If a guy is attracted to you, then he will probably make eye contact with you even if you are across the room and he may also flash you a smile.
Show less Got your eye on another guy, but not sure if he feels the same way about you? Finding out if a guy likes you can be tricky and even a bit scary. However, there are a number of signs you can look for to see if a guy is worth pursuing. To tell if another guy likes you, think about if he smiles at you a lot and makes sustained eye contact with you, which could be a sign that he's interested.