Laß jucken, Kumpel 5: Der Kumpel läßt das Jucken nicht (1975)

This is the fifth of six films in the series that began with "Lass jucken, Kumpel" in 1972. The first film was very successful and it's estimated over 4 million people saw it in German theaters.

Apparently the other five films in the series are all softcore, so this hardcore version is a real treat!

Many of the performers should be familiar to fans of the German classics. Only some of the actresses performed hardcore, as was typical of this era, when the transition from soft to hard was just beginning in Germany.

Gunter Otto is credited as co-writer and cinematographer. Otto later produced and directed many German classics, including many of the Josefine Mutzenbacher films (he took over after Hans Billian).

I wasn't able to find a synopsis of the plot, and with my limited German comprehension, I can only offer some educated guesses.

Uwe's wife Gerti is pregnant and she hasn't been interested in sex for quite some time, so he ends up having sex with several of the neighbors' wives and with a hitchhiker he picks up in his truck. The hitchhiker turns out to be the niece of one of his neighbors, who spies on her while she's masturbating. She catches him spying, and then moves in with Karl, Uwe's buddy who lives upstairs.

There seems to be a subplot about a boy whose parents were killed by a pimp (possibly the mother was a prostitute?) and now the boy is being raised by a hooker who was a friend of the parents. From what I can gather, it seems this boy and his parents were major characters in the earlier films, and there is some flashback footage of the parents that is probably taken from these prior films.

Perhaps a native German speaker can help me make sense of one scene I am curious about: The hitchhiker's uncle is sitting at the bar with a bunch of guys who seem to be making fun of him. He has a flashback or maybe he tells a story about some Nazi-era schoolgirls who march into a classroom and get undressed. They line up naked, and the instructress hands each of them a large piece of chalk, which they stick up their cunts (or maybe their assholes) from behind. Then they back up to the chalkboard and draw figure 8's on the board. At the end of the scene, the girls have gone away and the uncle is left cleaning the chalkboard. Maybe he was the janitor? What's the significance of this scene? Any guesses?

IMDB