Mark SloanMark Sloan, Head of Plastic Surgery, has a playboy personality that nearly jeopardized his friendship with Derek by having an affair with his wife, Addison Montgomery. However the two managed to resolve their issues and reaffirm their friendship. He has been given the nickname "McSteamy" by the female staff. Sloan had a relationship with Lexie Grey, though their relationship ended due to strain when Sloan's 18 year old daughter from a one night stand moved in with them. Sloan's daughter is also named Sloan. It was later revealed that she is pregnant. Mark wanted to keep the baby but Sloan decided to give it up for adoption
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