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"Charlie's Angels" star Cameron Diaz has revealed that sex is one of the reason of her youthful looks and is happy the way she looks.

"I don't want to look 25 again. The fountain of youth for me, 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, it's what we are here to do," contactmusic.com quoted Diaz as saying.