Arnold Schwarzenegger is one of the most iconic stars in Hollywood thanks to his roles in the Terminator movies.  With the immense fame that came with his public image, came a lot of X-rated antics and Arnold, or the women in his life, have been very open about what he got up to behind closed doors.  As the Austrian-American bodybuilder turns 73, Daily Star Online is having a rummage through Arnie's dirty laundry.  From open relationships to having sex five times a day, a secret love child to a gym orgy, it seems there isn't much that the Conan the Barbarian star hasn't done. Open relationship  Arnold and his former girlfriend Sue Moray were in an open relationship, she claimed.  He met the Beverly Hills hairdresser's assistant on Venice Beach in July 1977 and they were free to see other people.  Sue previously claimed: "We were faithful when we were both in LA... but when he was out of town, we were free to do whatever we wanted."  However later in the same year, it seems Arnold grew closer towards someone else, as he started dating Maria Shriver.  Sue told the Evening Standard in 2003 that other partners were "part of the turn-on for us".  She said: "He would tell me. Then I would tell him. But when I did, he got really mad. All he ever said about [Shriver] was that she was 'just a friend', but I didn't believe him." Gym 'gang bang'  In a 1977 interview with Oui magazine, when Arnold was 29 years old, he revealed he had engaged in a "gang bang" with other bodybuilders.  In the article, titled Arnold Schwarzenegger on the Sex Secrets of Bodybuilders, he described a group sex session in a gym in Venice.  The interviewer asked him if he was referring to a "gang bang", and he confirmed.  However he added it was "not everybody", instead just bodybuilders who were willing to have sex in front of other men.  Arnie referenced the sordid comments in 2003 at the starts of his political campaign, labelling them "crazy and outrageous" – but did not deny them.  He said on a Sacramento radio station: "I never lived my life to be a politician. I never lived my life to be the governor of California.  "Obviously, I've made statements that were ludicrous and crazy and outrageous and all of those things, because that's the way I always was." X-rated Playgirl shoot  A year after his "gang bang" bombshell, Arnold was set to pose in a saucy shoot for Playgirl magazine.  He said in his book that it would be set in "a traditional beer hall, but instead of hefty German women serving the beer steins...it would be young sexy girls with bare t**s."  By then he was in a relationship with Maria Shriver, and he claims she convinced him to shell out $7,000 to stop it from being published.  The muscle man said it wasn't jealousy behind Maria's request, but that she was thinking of his career instead.  "I thought you wanted to go into movies?" he says she asked him. "So if you pose with those girls and their t**s hanging out, is that going to make producers say, 'Hey,