Well, yeah, I've realized that too. Lesbians are basically considered as sexy to many other people, especially guys. Since girls are so open with themselves as it its, they are pretty accepting to it. Some girls find it fun to explore new things and having fun with another girl is sometimes on of them.
Also, I don't think anyone is very accepting to gays, except gays themselves. I'm not trying to insult them or anything, but may have a hard time accepting them to socieity. Many are repulsed by them. Although, some girls do get along with gays and try to accept them as another "girlfriend" or something, but sometimes they have a hard time accepting.