First and foremost, I admit I haven't read all the replies in the thread, so I don't know where the conversation is at. However, I did just want to give my own two cents.
Beyond that fact that I like porn with well hung men fucking women (my 1% gay in my profile) I am completely straight. I don't look for men, at men, or even consider any homosexual activity. It just doesn't appeal to me. However, I've been hit on several times by gay men at various bars and in various situations. I'm always very polite, and tell them that while I'm flattered that they are into me I'm straight and not interested. It's never been a problem.
I don't consider myself to be overly attractive, nor do I think I exhibit any "vibes" which would draw gay men to me. What it comes down to in my mind is simple. Generally speaking if you are single and interested in someone, the logical next step is to approach them and see if there is mutual interest. It has nothing to do with straight or gay. I'd expect gay men to pursue their interests every bit as much as I pursue my own. There's nothing weird about it. If there's something about me that gay men find interesting, so be it. To me, being hit on by a gay man reflects my own attempts with women. You at least have to take a chance or you'll never know.
Long story short, if you're being hit on enjoy it. At least you know someone finds you attractive. Not everybody has that.