The School of Flesh (movie, 1998)

In Paris, Dominique, a middle-aged fashion professional, solicits the services of the handsome Quentin , a bisexual bartender and prostitute who is 15 years her junior. After they first sleep together, their business transaction becomes transformed into a passionate love affair. However, the couple's romance becomes an ugly power struggle when social class and age distinctions begin to bubble toward the surface.