I google Duncanville Cherry Pit, big mistake-porn links. It’s advertised on swinging websites as a weekly club asking for donations. That takes it out of the normal residence dwelling use to an institutional use, IMO.
google=googled
I suppose the fact that these are not parties amongst “friends” but advertised to the public would make a difference.
I think cops shut down “raves” held at people’s homes for the same reason — once you advertise to the public, you are a business.
Still ... many businesses are operated out of a home. There must be limits based on the number of customers in a residence operating as a business.
PS. Visiting sites for swingers is probably a mistake. These are not always attractive people in the “lifestyle”.