The danger of his dude posse: now it's not just another woman who can rupture a relationship. His crew can wreak havoc too.(COSMO NEWS)(Brief article)

No woman in her right mind expects a guy to ditch his buddies just because he's half a couple. But there's a point where a man's allegiance to his entourage becomes a threat to your relationship. Take Kevin Federline, whose hangin'-with-my-homies MO may have stress-tested his marriage to Britney Spears. Example: One of the couple's Hawaiian getaways turned into a testosterone-fueled party, because Kevin reportedly hung with his posse during the vacay.

Then there's Leonardo DiCaprio, who throughout his on-and-off relationship with Gisele Bundchen, had a rep as a club-hopper. The crew who sometimes joined reportedly included actors Kevin Connolly and Tobey Maguire.

"Spending excessive time with friends is adolescent behavior and a way of dodging responsibility," says Robert Mark Alter, author of It's (Mostly) His Fault. "It's his way of saving 'You can't control me. I can do ...