Mischa Barton prefers kissing girls.

The former The O.C. actress finds it easier to relax during lesbian scenes for her film and TV shows because there is none of the tension that can build up when she has to get romantic on camera with members of the opposite sex.

Mischa, 23, said of her lesbian roles: "I don't know why that keeps coming up. It doesn't annoy me that much. It's so much easier to kiss another girl. You're so much more relaxed filming and you can have a laugh. It can get a bit tense with a guy."

Mischa Barton's love scenes with other girls include in The O.C., where her character, Marissa Cooper, had a relationship with Alex Kelly, played by Olivia Wilde and in TV series Once and Again, where she was pictured kissing Evan Rachel Wood.

She also famously starred in 2008 film You and I, about two teenage girls, and American and a Russian, how fall in love after meeting at a concert by faux lesbian Russian girl band t.A.T.u and subsequently get caught up in an underworld of drugs and murder.

The Beautiful Life star recently revealed she had never had her heart broken.

She said: "I've never been dumped. One tried to make it quite mutual though so that felt as close to dumping as I've got. I kind of lost it and was like, 'You are not turning this on me. I dumped you first.'

"I felt like my heart was broken at the end of a couple of relationships but it wasn't really."