France before 1789: When a widow hears that her lover is to marry her cousin's daughter, she asks the playboy Valmont to take the girl's virginity. But first, she bets him, with her body as prize, to seduce a virtuous, young, married woman.
Set in Baroque France, a scheming widow and her lover make a bet regarding the corruption of a recently married woman. The lover, Valmont, bets that he can seduce her, even though she is an honorable woman. If he wins, he can have his lover to do as he will. However, in the process of seducing the married woman, Valmont falls in love. Based on the same novel as "Dangerous Liaisons."
Valmont fucks the fiancee of the widow's lover at 1:12:08 and the virtuous, young married woman at 1:24:32 and 1:43:47. Only implied sex in all three scenes, though we see Valmont kiss the fiancee's naked bum for a bit.