Filhos e Amantes (1981)
While her boyfriend is banging another woman in a cabin, a chick hangs out with another guy and has sex with him in the in the outdoors.
Actors: Lúcia Veríssimo
Filhos e Amantes (1981) aka Sons and Lovers
During a weekend in a country house, friends and exes driven by strong emotions get together. One of them cheats on her boyfriend and another cheats on her lesbian partner.
As Feras (1995) aka The Beasts
A guy reluctantly lets his girlfriend have a lesbian affair, watches her have sex with the chick, and later regrets his decision.