亚当(乔什·亨德森 Josh Henderson 饰)是一名小有名气的音乐人,就在不久之前,他刚刚结束了一段失败的恋情,这段恋情带给了亚当极大的心理阴影,让他久久无法走出来。在痛定思痛之后,亚当开始反思,从而总结出了一套自创的“混蛋理论”,那就是女孩子都不会喜欢好男人,因此只要装成混蛋,就能轻易地俘获她们的芳心。 贯彻了混蛋理论的亚当误打误撞的开始了几段新的恋情,但是每一段都无法长久,也不能够带给亚当快乐。一天,亚当邂逅了名为茉莉(珍娜·迪万-塔图姆 Jenna Dewan-Tatum 饰)的女孩,当打算在茉莉身上故技重施时,亚当发现,自己的这套理论在茉莉身上根本就行不通。An aspiring recording artist, Adam, is burned by a bad relationship experience and decides that if women won't respond to the "nice guy" then he'll be "the jerk." This is wildly successful with meaningless relationships, but when Adam meets and falls for Molly, who doesn''t fall for his jerk routine, Adam is forced to reconsider his dating philosophy.