According to this scene, the kind of sex Christy Marks likes is rough anal sex and hard fucking

During this episode we learn that, Christy Marks, the girl next door has trained herself to need the most intense pleasure making her a perfect candidate for the show. Her boyfriend gets her off with crazy tit fucking and she enjoys some really good blow jobs. This turns her raw, altogether passionate lovemaking back onto herself and into a testimony to the sexual chemistry between two partners.