10. Black Swan
There is nothing sexy about shooting a sex scene. Surrounded by crew and worrying about minute technical details is not an aphrodisiac for most actors. Black Swan was no exception when it came time for Natalie Portman and Mila Kunis to film their sex scene. While audiences seemed to enjoy the finished product, the long-time friends have both gone on record saying it was one of the hardest scenes to shoot – though Kunis denies the rumor that they did shots of tequila to help get through it.