couch queen
A couch queen is a person who typically lays rather motionless during sex. See also Starfish. It normally makes for a rather underwhelming sexual experience. But it can be very arousing and stimulating if someone has a particular fetish for this, or for example if they are dominating.
I really was looking forward to having a good time with this person, but they turned out to be such a disappointment, they were a couch queen.