I've know a few, lesbian, gay and bi. I don't often make friends with people, regardless of anything because it's easier to keep people as aquaintances. I have my 3 or 4 friends and I'll hang out with anyone they know by extension.
I used to be friends with a guy in upper school who actually came out to me, which was an odd experience. After school ended I pretty much lost contact with everyone there though which is a shame because alot of them, including that guy, were cool people to have a laugh with.