Rogen Worried About Sweaty Sex Scenes With Heigl.... Actor Seth Rogen was terrified he'd sweat all over co-star Katherine Heigl during sex scenes in their new movie Knocked Up.The funnyman's hefty character impregnates the pretty Grey's Anatomy star during a boozy one-night stand in the romantic comedy - and he was terrified he'd gross out his castmate with his sweating.He says, "It's really kind of nerve wracking. If I was 18 years old that would've been literally as far as I'd ever been with a girl - because essentially you're dry humping a girl who you don't know very well."I was just afraid I was gonna sweat on her. That was my major concern, just drip a big gob of sweat onto her head."Luckily they're comedic sex scenes, which kind of helps. It's not like I'm supposed to be acting sexy which alleviates the pressure put on me to look attractive and sexy."

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