Guitar Face or "O" Face?

11/17/2006 2:45 PM PST

Guitar Face or "O" Face?

With all the facial contortions musicians make onstage, sometimes it looks as if they're gettin' busy with something besides their guitar. From the looks on their faces, these rockers are clearly enjoying themselves. Details asks if they're gettin' down or gettin' off.

Sheryl Crow, for example, looks as if she's visiting a very special place, but my guess is she's gettin' some six string action, not the other kind. Avril looks as if she may be ready to spit again ... perhaps she's just self-involved and not going to work backstage?

Details.com has a panoply of porn and rock star faces for your perusal. Your job: figure out which is which!