SEX KEEPS CAMERON DIAZ YOUNG

In regards to staying young and maintaining her hot body, Diaz, 37 said "The fountain of youth? Let's see - I guess it's exercise, healthy diet, lots of water, lots of laughter, lots of sex - yes, sex, we need that as human beings. It's healthy, it's natural."

Hmm, that explains why Diaz always walks around with a huge grin on her face.

Though Cameron fessed up about her secret of youth, she was less forthcoming about her current love life with Yankees slugger Alex Rodriguez. When asked if she's in love, she sidestepped by saying, "You know what? Yes I am. I'm in love with life."

Cameron also waxed lyrical on the following subjects:

Whether she's open to plastic surgery:
"Yeah, well, hey. I'm not doing anything right now. But we'll see. So far, so good. But I'll never say never to anything."

The star has previously said she doesn't believe in plastic surgery but seems to have changed her mind over time.

Cameron Diaz says the secret to her youthful looks is sex and lots of it! (WireImage.com)
Cameron Diaz says the secret to her youthful looks is sex and lots of it! (WireImage.com)



On feeling the baby urge:
"You know how you have these moments of feeling dissatisfied and you think, 'what would make my life better?' Well, I've yet to go, 'Aha, that's it: a child!' I don't want to not do a film at a moment's notice… But don’t get me wrong, I’m 100 percent committed when I commit to somebody or something. I'm a full-on nurturer – that's all I do," she explained.

On leaving her hard partying days behind:
"I'm 37. Those years are over for me. There are nights, sure, when you order more bottles of wine than you realize and then the bill comes and you go woah!" But I don't like waking up feeling gross. I don’t like to lose my day," she added when asked about what she does to stay in shape.

In the same interview, Diaz also spoke about her upcoming film, "The Bad Teacher," in which she stars opposite, former boyfriend Justin Timberlake.

Asked about her part in the comedy, Cameron says she plays "a very, very bad gold digger" looking to fund a boob job. "I'm having the best time playing her," she says. Her character "doesn't give a s*** about anyone but herself. I'm sure we'll offend everyone with it, which is great."

Cameron's new action flick "Knight & Day" with Tom Cruise opens July 15.

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Check out the awesome "Knight & Day" trailer