What’s the difference...

I saw an advertisement (before the whole Covid thing) that it was a ‘private’ party where people all gather with similar interest and wear their kinky gear etc etc with the full intention of doing the biz.

I know a brothel is technically illegal and the term is ‘two or more’ & you are paying for it. But the above instance, people pay to get in & are going to have intercourse and there is a substantial amount more people.

Do we need to start a club and have scan in cards to make this all legit. I have inadvertently broken the code and figured it all out to stay above board. The intent of this is to query why some ladies can’t share for safety & is it one rule for one situation and another when suits?