Do you know the name of a retro German pornographic movie from the 80s or 70s with the blue danube playing?

The only thing I remember from the movie is that in one scene they are
having sex in time to a band playing blue danube, with thrusts in time
to the music. Funny I know.

Sorry that's all the info I have hence the need to ask the question. I
would guess it was made in the 70's but I saw it on tape in the 80's
so could well have been made in that decade.