I've been looking into doing duos with a friend, however I am really confused about how brothel keeping laws work with this kind of arrangement. As far as I can understand, outcalls are fine but taking incalls as a duo would count as brothel keeping right? What about taking duo incalls from an (well-known short-term rental site) or hotel etc?
I know there are ways around this but I personally try to keep things above board as much as possible

Do you know If the law is the same in Scotland. If I allow one friend to work from my property( I would be present but only for security) then that isn't a brothel is it?

I have heard of scottish police making booking with different SPs and then if the address is the same they are charged (or shut down) for running a brothel. 

Thank you for taking the time to research for me. I tried looking it up myself but my head wasn't in the right place to deal with all the legal jargon. I have worked in Edinburgh saunas and I know they tried to shut them down when police scotland took over but. There was some kind of old contract that had been signed many years ago. Glasgow saunas were shut down (apart from gay ones).
 Although the saunas are still allowed in Edinburgh they are not really licensed just tolerated. But compared to most parlours in England they have to be very discreet in the marketing and advertising. And you are not really supposed to mention anything about sexual services until in the room with the clients.

I wouldn't advertise online only rent discreetly to friends and really there is no need for anyone to know they are paying me at all. I can just say I'm helping them out because they need somewhere safe. I was actually going to let my friend work there for free once because she was doing car meets and I was concerned for her safety.

Scotland is quite backwards when it comes to the sex industry unfortunately. If I did get a knock from the police I would just apologise plead ignorance and stop what I was doing. I doubt they would take it any further. But yes I might try SCOT PEP for more localised advise

Obviously I don't know much about gay Saunas but I heard the mayor of Glasgow is gay...might be why they didn't shut them down. I don't know if that's actually true.

Obviously I guess the way the police define or choose to take action against brothels is very much down to the region anywhere in the UK. I work in various parlours/Saunas/agency flats around the country and they are all working with the consent of local police. Some brothels do exploit workers and do need closing down but when it just people sharing for safety hopefully most police forces will recognise the difference.