Der Spiegel has a disturbing report about the German left of several decades ago:

Sexual liberation was at the top of the agenda of the young revolutionaries who, in 1967, began turning society upside down. The control of sexual desire was seen as an instrument of domination, which bourgeois society used to uphold its power. Everything that the innovators perceived as wrong and harmful has its origins in this concept: man's aggression, greed and desire to own things, as well as his willingness to submit to authority. The student radicals believed that only those who liberated themselves from sexual repression could be truly free.

To them, it seemed obvious that liberation should begin at an early age. Once sexual inhibitions had taken root, they reasoned, everything that followed was merely the treatment of symptoms. They were convinced that it was much better to prevent those inhibitions from developing in the first place.

The results of putting this idea into practice are recounted rather graphically here.