We often mock Matthew McConaughey for taking his shirt off a lot. The truth, of course, is that if The Hollywood Gossip had those abs and pecs, we'd never hide behind a monitor.

Now, though, props must be given to the chiseled actor for keeping all his clothes on in the face of a shady threesome. And, no, it wasn't with Lance Armstrong and his bike.

McConaughey recently told Loaded magazine the following story:

"Two sisters once offered themselves to me. But they weren't single and one wanted to get away from her husband. I don't jive with that. You don't sleep with someone's lady if they're married because it will return and bite you in the ass."

Amen, Matthew. We'd assume, of course, that the sisters in question were Paris and Nicky Hilton. But neither is married.

The same unwed status removes Mary-Kate and Ashley Olsen from the running. So we give up.

Of course, this could've taken place earlier last year ... and Jessica Simpson was still hitched at that time ... and Ashlee likes to have fun ... and Crazy Joe Simpson might have encouraged the romp ...