Well, it's pretty much all there in the title. Lucy Liu, nude, in a lesbian vampire sex scene. With Carla Gugino.
That's basically all you can ask for, really. This scene from Lucy Liu's new movie, Rise: The Blood Hunter, in which she plays a Vampire Hunter, is pretty sexy, what with the Carla Gugino licking Lucy Liu's face, though I could do with a little less blood.
We've also got another clip of Lucy Liu waking up in a morgue on a body slab, locked in the wall. Note: If you're claustrophobic, this might freak you out. The movie is also said to show Lucy Liu nude in a full frontal scene.
How come they never showed this kind of thing on Buffy the Vampire Slayer?