A businessman (who everyone for some reason calls “the professor” cheats a count out of his seaside castle. He moves his sickly wife to the castle and while she’s terminally ill and bed-ridden, he proceeds to freely philander with his wife’s nurse (Femi Benussi), who actually falls in love with the cad, with his sexy blonde secretary, and with a young college girl (Erna Schurer), who is part of group students hanging around the beach whom he takes sailing on his yacht while his ailing wife and lovestruck mistress are stuck at home. He gets his comeuppance though when one the women he has wronged basically decides to screw him to death (which is perhaps not the most terrible kind of vengeance imaginable).
This death-by-sex plot wasn’t quite the old saw in 1974 that it is today, but it is very ham-handedly executed. The man is fairly young and fit at the beginning of the movie, but several weeks later he is on his deathbed (yet still apparently able to have more sex).
You may have thought the (pretty daft) plot idea of killing a man by making him have too much and too intensive sexual intercourse originated from the American Erotic Thriller of the late 80s or early 90s. In that case you were wrong. The idea popped up a few times in 70s Italian exploiters (and probably earlier than that) and this film is a perfect example. Erna Schurer is the femme fatale who avenges the financial misfortune of her father by entering the life of the culprit, seducing him, marrying him and then bonking him to death. The lucky bastard.