This question makes me laugh. Like seriously. It makes me think back to my teenage years. I have had girls who were my friends in high school who were lesbians, but they knew where they stood with me. Your preference just don't ever try anything with me. I am not a lesbian, although I have nothing against some one who is.
The first time I can think of ever being hit on by a girl I was probably about 14 years old. I was hanging out with a bunch of friends and a friend of one of the other girls was a lesbian. She ended up grabbing my ass and telling me I was "way too hott!" Lol. Okay sure.