Credit: Matthew Rolston for

Bleeding love!

True Blood's love triangle of Sookie (Anna Paquin), Bill (Stephen Moyer) and Eric (Alexander Skaarsgard) bare all on the new cover of Rolling Stone, out this week.

Covered in gobs of fake blood, Paquin, her real-life fiance Moyer and Skaarsgard get completely naked -- and reveal secrets from the HBO smash -- for the mag.

Moyer offers up an elaborate theory on what makes vampires -- from True Blood, the Twilight Saga and elsewhere -- so attractive.

"If we go from a base level, vampires create a hole in the neck where there wasn't one before," the actor says. (See behind-the-scenes pics from their cover shoot) "It's a de-virginization...creating blood and then drinking the virginal blood. And there's something sharp, the fang, which is probing and penetrating and moving into it. So that's pretty sexy."

He adds, laughing: "Plus, Robert Pattinson is just hot, right?"