Surely if you pay a civvie for sex she's then a WG?
Many years ago, as a teen, I was looked after briefly by a well off couple and their not particularly attractive housekeeper did get into bed with me one night and carnal knowledge was exchanged. She asked for cash afterwards and I said I wouldn't have gone through with it if I'd known and she said the husband there always paid her! Come to think of it this almost counts as my first punt, damn.
Again, a decade or so ago, I was training in the Midlands and stayed at a B and B. The owner propositions me one night and I thought why not, again she said afterwards it wasn't free but optional tip. She said construction workers staying always tipped her well and she'd even been spitroasted by two (fortunately there was only me there). Middle aged swinger type bird.
Come to think of it, in the sharing economy and Airbnb there's surely more potential for this sort of on the game work for them?
I think you can make the case for there being people in half-way states, like toyboys or trophy wives; Richard Gere's having a kid at 68 with some 35 Spanish ex-model for God's sake - you can't tell me that's not a partnership with a bit of a business arrangement baked into it. I also seem to remember how Maggie McNeill of the Honest Courtesan blog has an interesting post somewhere about her winding path to becoming an escort, including how she became known for her err, compensated dating practices among horny students whilst at university (definitely used to be one of my favourite blog writers back in the day, though I haven't read her much lately).
I do think most people would like to meet the sort-of-maybe-on-occasion amateur/impromptu sex sellers more often, if only because it fulfills the common porn-type fantasy of just being able to bang some random cute woman you just ran into in your everyday life, hence the popularity of all those "sex with [insert job title here]" porn videos out there.
Anyway, I've clearly been going to the wrong bed and breakfasts etc, as I've yet to have any maid/barista/land lady etc etc spontaneously imply there could ever anything more than a strictly professional relationship between us
. I'd quite enjoy my MILF swingers if it was only a matter of getting them off a few times and bunging them £50 the next morning before going down for breakfast. Sounds like a good way to spend a weekend!