A bit sweeping, op.
Just like society you'll get a cross section of shitty ones, okay ones and nice one's, they're not all the same.
To answer your first part, I've not seen many gay females around here, I'm guessing ten who openly state that on their profile in 7 years.
"Hi everyone. Just wondering how many lesbians are on here. I find them very friendly and extremely sexy. X"
We tend to find that lesbians don’t find guys sexy however