Thank you all very much!
I really appreciate your insights and the links, which you posted, were a great start!
I would'nt be in it for the money or anything. But I have a few plots in my head, that I see coming out some time. And as actually no one writes without an audience in mind (even with journals there's usually something in you, wishing the material to be found)... I wanted to get to know the mechanics of writing bdsm-erotica.
In my day job I'm performing and producing in the German-speaking Spoken-Word-Scene and doing lots of off-theatre stuff. Now that I said it, "German-speaking Spoken-Word" does sound like a build up for a monty python sketch.

I don't believe "money" / capitalism to be something good for the way we do and enjoy arts as a society. But getting into a production process, wherefore commercialization can be a medium, helps me, to keep my inner "genius" in check. You know, that bitter notion, that either you're "it" and you've been "it" all along, or you're not, and you just don't have "it" in you...
And this kinky-thing is to special for me. I couldn't stand, if it were another reason for self-doubt.

In Germany most performing arts projects start with an application for grants. You argue why your idea is beneficial for the people. That's screwed up in its own way, but... it does keep my self-perception okay.
Knowing art to be all manufacturing, teamwork and division of labour really helps me.
So that's why I had this strange question. I want to write a few spanking erotica pieces in German.
Just don't want to be alone with an audience

So thanks again and all the best to you all!