Whoa, whoa, whoa...Graviation is a yaoi (well...shouen-ai) about a ROCK BAND. Suichi falls in love with Yuki, who is a famous writer, except that Yuki is running away from a horrible past where he was nearly molested by a tutor whilst in America, so he doesn't want to get involved ith Suichi.... Jeez. No one is bisexual, where did that come from?
Princess Princess is cute --about an all-boys school where the cutest (prettiest) boys are asked to dress as girls for special occasions to boost the boys moral (There is obviously a bigger story, but that's why they're cross dressing).
Elfen Leid is supposed to be very graphic --we were going to watch it at my anime club, but then they were like, "Nooo, lets not chance getting into trouble". I'm not sure if it's graphic sexually or if it's very gory --I have an inkling it may be both?
...Now that I'm done commenting, may I also suggest Rosario Vampire, which is of my new favorites (I like cute monsters!), Pumpkin Scissors, Blood+, Welcome to the NHK, Cardcaptor Sakura, and everyone should watch Honey and Clover. It's adorable.