Ben Cronin has it all: the admiration of his many friends, a terrific girlfriend, and he's on the fast-track to an athletic scholarship. Ben's rock-solid, promising future and romance are turned upside-down with the arrival of Madison Bell. Madison, the new girl in town, quickly sets her sights on the impressionable Ben. While their first few meetings are innocent enough, the obsessive and seductive Madison wants more ... much more.
At 20:10, Madison, the new girl in school, seduces swimming star athlete Ben in the pool. She kisses him and they have implied sex. According to her, she has a boyfriend waiting in New York but they agreed that they can see other people (a.k.a. open relationship) until they start living together.
Ben meets Madison's boyfriend later and finds out that it's not exactly a straight-up open relationship between him and Madison.