The 29-year-old actor - who is currently dating 21-year-old country singer Taylor Swift - was happy to get naked for his role in movie `Love & Other Drugs` because he believes the audience needed to see him without clothes to believe his relationship with co-star Anne Hathaway`s character was real.

He said: "If we were going to be as open and intimate in a love story as we could be we have to do the same thing with sex.

"When you see two people in a movie like that, particularly as an actor, and they are portraying two people in love, it`s like, how do you even unconsciously believe people are in love if they don`t want to be naked around each other.

"I don`t know about you guys but I`ve never had sex with underwear on and it`s an odd thing to watch an actor do. You can try but I wouldn`t recommend it! So that was really important. We knew that if we did we would get somewhere in the audiences` unconscious that these were people who were actually in love and not just actors telling a love story."

The Hollywood hunk wasn`t scared about getting nude and didn`t consider working out any harder at the gym for the role of pharmaceutical rep` Jamie Randall.

He added to BANG Showbiz: "We really didn`t think about getting in shape. I wanted him to be a little skinny and sinewy and slimy."
sections: Celebrities