Topsy Turvy (1983)

The act is going on in the year of 1939. 17-year-old year old Thomas has other things to worry about than what is going on around the world. He's from a bourgeois home, but when he meets the Thamms, the neighboring family, his world is turned upside-down. They are an eccentric family and they don't take life so seriously, and Thomas is introduced to all forms of sex.