Horny Lesbian Koalas Upstage Andy Roddick

The week's hot viral video is an interview with tennis star Andy Roddick in which the background activity becomes so compelling that it quickly turns into a video of the tennis star's left shoulder. Yes, those are koalas, getting busy in a tree. The video was a sensation—Roddick, not one to hold a grudge, helped by tweeting a link—even before it emerged that both marsupials are female.

"When they are ready to be with a male, one of the things they do to express that is to pretend to mate another female," said an expert at the Lone Pine Sanctuary and koala lovenest in Brisbane. "As what happened with Sprite and Saffron, they often start in one position and then swap so they both get a turn."
(More Andy Roddick stories.)