Without naming names, I've "set off people's gaydar" before. Not to the point of getting hit on -- or maybe I was, and was just too oblivious to notice, that can happen -- but I'm not always the most obvious heterosexual. Someone once admitted to having trouble imagining me being interested in anyone. To this person, it was easier to imagine I was practically non-sexual. Nope. Heterosexual.
Message to the women who've been interested in me, and I know they're around: Yeah, I'm really bad at noticing. As are many guys, but I can't use that as an excuse. I'm also slowly trying to be better at noticing. Be better at being social just in general, too.
Message to the men, if any, who've been interested in me: Not gonna happen. Sorry.
I'll figure this out. *hums "It's Not Unusual" by Tom Jones to get motivated*