Decameron X 2 (1995)

You have never seen so many sexual encounters in such scorching scenarios until you've followed the crowd to Amy's place!

A disinherited adventurer, and two undercover police agents. Bored and lonely, the beautiful woman accepts the courtmanship of three men she meets on the train: First, an American businessman, then a Hapsburgic officer, and lastly a Spanish bullfighter. In the end we find out that these three are none other than the lady's husband whom, cleverly disguised, has impersonated the three men in order to play an erotic game with the intent of awakening the passion between his wife and himself