Foam Party! (aka Como la espuma)
An eager wife and a reluctant husband join an orgy party. The husband ends up in a gay situation while the wife gets it on with a young male virgin and a muscular brute.
swinging but wife also cheats
Nothing to Hide II: Justine (1993)
Justine takes a lover, not knowing that he is her boyfriend’s father.
Antes de morir piensa en mí (aka Before You Die, Think Of Me)
An old man sets up his young wife to have an affair with his young co-worker because he can’t satisfy her sexually. It becomes a problem when she falls for the young guy.
Devil in the Flesh (aka Le malizie di Venere aka Venus in Furs)
A decadent aristocrat convinces his wife (Laura Antonelli) to participate in his strange sexual fantasies.