The Sweet Charm of Sin (1987)
A wife seduces her own gay son to make a man out of him and also screws his gay lover in front of him to further prove the point.
Actors: Danila Trebbi
The Sister of Ursula (1978)
While searching for their estranged mother, two beautiful sisters, Dagmar and Ursula, arrive at a luxurious seaside hotel. At the same time, a mysterious killer starts murdering promiscuous women in the area.