Director: Lasse Braun; Title: Dirty Head; one of the "Loop Series", made around 1975, also to find in the "Adult Loop Database"; and, by the way, Lasse Braun is/was the father of Axel Braun.
Shame there's not an English version of this, I can only guess she is late due to her doing her hair so he decides to shave her head as a punishment so she is not late again due to her hair as she now hasn't got any.
Ganz so krass ist es bei mir nicht. Mir reicht ein schöner Pixie Haircut. Die Schambehaarung darf eine Frau auch ruhig dran lassen. Rasiert ist aber auch schön.