I read the story and thought "I'll give £140 to make me a cup of tea ... and then we just happen to have sex". In other words, they may pass a law but there will be easy ways around it.
I had thought along those lines myself. It would be hard to prove.
However, if the girl is advertising sex for sale (say on AW) and you get caught having sex with her and you tell them you paid her £140 to make a cup of tea, the old Bill may very well not believe you! Probably best not to mention the money!
I see a regular who has a couple of kids and a partner, all legit and low key.
If I happen to pop round and have sex when hubby's at work there's no crime there, unless they can prove that the money I gave her to help with the bills was for sex.
If it comes in here, I can see myself avoiding WG's that have massive publicity as that will only draw attention.
BTW I like your avatar Dipsy Doodle, is that the bird from East Enders?