A woman, Jessica, turns down a man's advances while working as a bartender. Later he shows up on the street but she blows him off.
Soon afterwards, the woman is grabbed from behind and is raped. She reports to SVU that her rapist told her that he couldn't help it because he had a gene for rape. She asks if there's any such thing. Benson tells her that's ridiculous.
The detectives quickly find that the rapist is a man named Nick Brown. Nick claims he has the rape gene and immediately confesses to the rape. He says he knows who a serial rapist is.
Nick's testimony leads the detectives to listen in on a rapist support group. Things turn ugly when another member discovers Nick is wearing a wire and tries to assault him with a knife. The detectives rush in and arrest everyone. Three victims ID Sam Dalton as the rapist.
It seems like an open and shut case but then Sam's lawyer makes a motion to suppress Sam's confession and the witness ID's because the therapy group was privileged. The defense wins this motion despite the fact that the group leader got ordained online after only two weeks of study.
The detectives find a way around this when another group member, Will, admits to having coffee with Sam. But Will disappears when he is supposed to testify and he is found trying to jump off a ledge. Benson talks him down and he then testifies.
Benson goes home and watches over her sleeping son, who she worries will turn out to be violent like his father.