What Every Frenchwoman Wants (1986)

After three long years of absence, 19 -year-old boarding school student Roger returns home to spend his summer vacation. And brimming with ever-growing sexual curiosity, Roger realises that his parents' mansion is a tantalising playground full of women and dirty little secrets.

But as Roger's dormant teenage sexual force awakens, suddenly, WWI breaks out, and from a docile and gentle kid, Roger transforms into a kinky rascal left all alone to console the lonely and unprotected women like a rooster in a hen house. Now, surrounded by temptation, Roger has no choice but to expand his education in titillating ways.