I have twice lived in places that used to be brothels.
The first time, we had no idea, because the place had moved across the road. Then their landlord's wife discovered who the tenants were, and they moved.
The old customers figured (I suppose because we were a share household, and there were men coming and going a lot) they had moved back to our place.
At that time (mid seventies) although we lived in the middle of the city, we never locked our doors. This was one of those places that attracted lots of friends all the time (including the middle of the night, as Sally and I finished work very late, and our fellas and friends knew our schedule), so there always seemed to be people around.
Anyhoo, very late one night, beloved and I were sleeping peacefully, when a drunk ( a BIG one) careered into my bedroom......asking "Is this the "health studio:?"
Beloved, who was a quick, if evil, thinker, immediately said: "Oh, sorry mate, there's only one on tonight, and I have booked her all night."
As I spluttered and protested, the drunk left like a lamb.
Beloved explained, against my indignant protests, that this was the easiest and least dangerous way of getting rid of him.
We locked the door after that. A surprising number of seedy looking men were keen on improving their health that year.