I have read your search for a while and actually have quite a bit of experience with this as well as quite some success. Now that I am way older my success rate is down but let me try and give you and others some advice.
First it is ALWAYS hard to find someone you are compatible in life with. (I assume you are looking for long term?) In regular straight relationships well over 50% of them fail.
Second, we are a minority, and a subset of a subset and as such there are way fewer people available.
Now when you take these two things into consideration it becomes a very steep road to climb, but remember there are many who have been to the top of Everst and what you are seeking (as well as myself) may be akin to that.
The first thing to know and understand is EXACTLY what you are looking for. If you are seeking someone you can torture 24/7 keep locked in a cage forever, etc., then you are most likely not going to find it for that is the stuff of fantasy.
Next you need to unerstand that keeping and having a "slave" (at least in my experience) is an expensiver proceedure. I have not seen much here that explains what it is that you are seeking or what conditions the prospective slave can look forward to.
I thnk I have written enough for a start, but let me add one other thing:
Third, it is very important to remember the old adege if at first you don't succeed try try again
