Going Under (2004)

Peter, a married psychotherapist, finds himself entangled in an intense affair with Suzanne, a skilled dominatrix. Their relationship thrives within the confines of an S&M dungeon, where strict boundaries govern their encounters. However, everything changes when they decide to meet outside the dungeon's walls. As Peter's fixation on the emotionally scarred Suzanne deepens, they plunge into a chaotic exploration of their dark histories and primal urges. Their connection spirals into a complex web of desire and psychological turmoil, revealing the depths of their troubled pasts and the consequences of their choices.