I attend a very conservative school yet lesbians in sororities aren't a big deal at all. Gay guys in fraternities..well...that's a different story.
Now, I've had 2 recent lesbian sisters, they brought their girlfriends to formal and all, loved the sis and the gf no matter what, heh
We even changed our a page on our website from "Sisters and their Men" to "Sisters to their Significant Others' because we didn't want one of our girls feeling left out. *nods*