Hugh Hefner vows to carry on having sex until he's 100

Playboy founder Hugh Hefner has vowed to carry on having sex until he's 100.

81-year-old Hugh -  who has three live-in lovers, says he'll still be up for bedroom action even when he reaches the landmark age.

He said: "I'll keep having sex until I'm 100. I have three girlfriends, a TV show and a hugely popular men's magazine."

Hugh lives in the notorious Playboy mansion with girlfriends Holly Madison, Kendra Wilkinson and Bridget Marquardt but revealed he is ready to commit himself to Holly.

He said: "I do eventually think Holly and I will have a monogamous relationship.

"Do Kendra and Bridget know that? Sure it's fine with them, they are here for very different reasons."

Kendra recently admitted that Hugh fails to satisfy her in the bedroom. "I'm 22 and still have my whole sex life ahead of me," she said. "I still have a lot of sex years ahead of me. But all girls need a vibrator!"