I have this problem all of the time, only in reverse. I'm a gay girl, and I keep attracting guys. Guys that know that I'm gay. I had a male stalker in high school that carved my name into his arm with a knife. Another guy in high school fell in love with me. One of my male friends in college asked me out, knowing that I'm gay. Another male friend in college asked me to be his fuck-buddy.
What the hell? I'm not even a lipstick lesbian. I'm scrawny and flat-chested, have super-short hair, tattoos, piercings, and usually am wearing a tank, ratty jeans, and steel-toed boots. And I smoke. I do not understand.
That said, I've never had any trouble attracting girls either, thankfully. My "straight" Catholic roommate in college fell for me, even. Us dating made things awkward for our other roommate in our triple who also happened to be Catholic, though. xD