(Cover) - EN Showbiz - Ashton Kutcher has joked he would have liked his butt to be CGI lifted in his new film.

The Hollywood actor stars alongside Natalie Portman in romantic comedy No Strings Attached, about two lifelong friends who take their relationship to the next level. While the pair vow just to have fun together things soon become complicated when feelings get involved.

Ashton and Natalie had to shoot several sex scenes for the movie. Throughout the film, the hunk's butt becomes a regular fixture and Ashton isnt sure it looks that impressive on the big screen.

It was my ass, but its GGI enhanced. I was hoping theyd give me a bit more shadow lift to even out the skin, he joked on the Kyle and Jackie O radio show.

The 32-year-old who is married to Demi Moore cites the film as being different to a standard rom-com movie. Ashton says the film deals with relationships from a fresh stance, where relationships are far more complicated than is sometimes depicted in Hollywood movies.

This movie in particular is a bit different because its a twist on the relationship. Instead of ending with the sex it starts with it. Its a lot more modern than most romantic comedies, he said.

Ashton who is renowned for acting in a number of romantic comedies revealed he would like to challenge himself with the next part he chooses.

I think Id really like to play a villain it would just have to be the right one, he said. (C) Cover Media