Folle de moi (1996)

A 14 year old boy named Renaud Guerin does not want his father to remarry after his mother left him. The father, though, with all intentions to get married again to his love interest, Claire, decides to hide the plan from his son. The boy spends a lot of time in a private school and his father comes to visit on the weekends. However, the father arranges for his prospective wife to come do the visiting so that the two can maybe grow a fondness for one another. Renaud doesn’t like this set up either, and asks a friend, Stéphane, to take his place for these weekends.

Grace de Capitani plays the father’s new love interest, Claire. After a little bit of bedroom romping, Grace gets out of the bed and shows off her ridiculous rump as she walks into the bathroom. If only Claire could do more scenes bare.