It is kind of icky that the johns know where the host's home is and that they may construe something about the host by the behavior of the guest. It is also not something that one would want one's neighbors to become aware of.
This falls into the category of AWKWARD! You could ask the guest if she is 'working' and if she is she will probably tell you. If she is not 'working' she might not even know what you mean so no harm done and she'll just say she's on vacation.
If she says yes, then tell her that she really cannot give your address to her customers and that she should either relocate her business or meet them somewhere else. If she says no, then you could say to her, "Well it just looked like that might be the situation and I'd prefer it if you had your friends pick you up at a more neutral location so that it doesn't look like that to my neighbors because this is a RESIDENTIAL neighborhood."
OR, you could have a small dinner party and invite some men in blue, but ask them to please come in uniform and park their patrol cars out front.
