Seth Rogen cringes when he recalls his first attempt to become romantically involved with a girl - he bypassed kissing and grabbed her breast. The Knocked Up star attributes his lack of tact to being exposed to too much pornography at a young age.

Rogen says, "I watched a lot of porno as a child. So pretty much everything I knew about women, I learned from pornography, which is not right. It's not what it's like to be with a woman at all. So when I was young I was with a girl. I liked her a lot and I wanted to kiss her, and I thought, 'If this was a porno movie, I would have touched her breast by now.' I didn't think that maybe I should kiss her first. That didn't occur to me, because in porno they just go for it. So that's what I did. We were talking about soup or something - we were at summer camp - and I just (grabbed her breast). She looked at me, and I can remember the exact words, she looked at it (his hand on her breast) and then looked up at me with a quizzical look and said, 'What's up with that?' And that's the only breast I've touched."

-Enter here to win a 'Knocked Up' care package!

(This news article provided by World Entertainment News Network)