The Swinger.

James and Lily are a nice couple from the country in a bit of a sexual rut. When James gets called down to the big city to work at a fancy law firm, the two decide to see if L.A. can spice up their sex lives. But James' new boss, India, is much more than a sharp, power-hungry authoritarian. With eyes on the new guy and his sporty wife, she devises to send them off in a devious goose-chases of self-discovery, ultimately leading them back to her secret world where swinging is more than an amusing pastime.