The feminist part of our party (we're all feminist, just this part is run by women focussing on women specifically) is focussing on sex under socialism now and it gets some people's panties in a twist for sure.
It's an unspoken part of reactionary thinking, but I think it really is common for reactionary cishet men to genuinely be afraid of women that enjoy sex.
Control thing. A woman knowing what she wants or a woman enjoying multiple sexual partners in life is not seen as submissive to the man enough. In their eyes, women need to serve, not have control over their own life and desires.
They were also consistently ahead of the "BRD" regarding LGBT rights. The reason gay sex was finally completely legalised in all of Germany was that it would be bad press for the "BRD" regime to take away rights from east German LGBT people when they made a new criminal code to go with the annexation of the GDR.