MICHELLE Trachtenberg says kissing Zac Efron was like making out with cardboard. The Gossip Girl star — who has locked lips with a number of Hollywood hunks — says she hates shooting intimate scenes with her male costars, no matter how sexy they are.

“Kissing scenes for me are just like kissing cardboard,” says Michelle, who locked lips with Efron in the movie 17 Again. “There are so many dudes around you it’s so unsexy. “It’s like, ‘Right, just stick your tongue in my mouth again’. There’s actually not supposed to be any tongue in movie kissing — it’s just the lip smacking. You’re not supposed to get all tonguey on me. ” I just wear really high heels and step on their feet, like ‘Dude, back it up!’”