I will sometimes wonder how much a woman would charge if she were a WG. On some occasions this has lead to chatting her up and on at least one or more occasion fucking her. I would never pop the question of course, but merely thinking about involves taking an interest with options open.
I think it maybe stemmed from walking near the old RLD of Glasgow where art students would hang out and sometimes do tricks, or driving round an area that might have prossies but not knowing if any particular woman was a prossies. If you spoke to them you had to wait until they said, "Are you looking for business" and then and only then quickly negotiate a price.
It's like saying with very subtle body language that you might be interested but maintaining correct politeness and respectable etiquette.
Nice.