A sex addict, psychologically unable to have sex with the first woman he’s ever loved, returns to his old psychiatrist, a twisted and manipulative woman, and the only one who has come close to curing his fractured psyche.

Okay. Thanks everyone. I'll see what I can do.

Valid points by dpg and Ckharper. A 'reformed sex addict' is a better way to let us care about what happens to him.

What makes it a thriller? Is it what happens when he returns to his old psychiatrist? That's something we know nothing about. Suggesting her goal would tell us about the nature of his obstacle.

A reformed sex addict can't bring himself to have sex with the one woman he's truly in love with, so he seeks help from a former psychiatrist?but maybe she's the problem.