Bronson is thinking nasty sexual things and needs to make them reality. Notice that he says “we” should be on bedrest, not just him.

Bronson has mentioned “retard shit” and basement classes before.
I’m on the third floor, your class was in the basement/
You know what that means; you got a hint of retardation.
The “free form jazz band” might suggest that he and his lady are improvising their sex game as they go along.