In 1954, a missing Helge returns, but he’ll only speak to Noah. In 1987, Claudia brings the time machine to Tannhaus, and Egon questions Ulrich again.
So, they started showing scenes of sex, those that are pretty normal today, but not back then, a century ago. E.g. a lesbian sex.
Also, Claudia had some sexual relationships with the dad of
By the way, that weird bold guy looks similar to The Red Skull