What is the movie name

Plot :- Father big shot like minister , son is young , unknowingly both are loving a young sexy girl. Father & girl enjoy various positions of sex on regularly. One day boy wanted to give surprise birthday gift to his lover, so he enteres in her house without intimation & he observs vigours sex between his father & lover with great mental shock. Accidentally he falls down from 1 st floor to ground floor & died. His father runs nakedly to save his son & start crying for son's death.

I've seen this film, I think it may have been based in france or italy?

Trying to remember the name...