I don't see why oral with out and kissing is such a problem, could the problems be happening because of the internet, and the escorts, can be kind of fussy who they see, not like when you could just walk into a sauna, and pick your fav girl
The escort I used to see, allowed full on kissing, oral was always with out condoms, there was no objection to you fingering her pussy, and the funny thing was, it never crossed my mind, hey the guy before me, he been licking here pussy, they been kissing, and she has been sucking his cock
I think all of this has happened mostly because of AW, and it likes and dislikes profiles
Far before AW becomes popular this add ons/extras which are considered as extra service is already there.
I got explanations from WGs : :
For OWO: Some or or might be many punters do not have a good hygiene. So a WG doing OWO will get a terrible smells .... From a punter POV I myself will not going down on her If I get a terrible stinky smell. Also the possibility to get STI is more with OWO
For Kissing especially deep french kissing, Some or or might be many WGs consider kissing as a sign of personal intimacy. So they will leave it the DFK for their lovers, or they will put a high price for it for deterrent as well as big gain for the service they do not actually like.
But another plausible explanation is of course to take advantage. Even they do not offer this OWO or DFK punters are still coming as many punters come there just for the main course e.g. P***y. The good examples for this are punting a Soho Models or window shopping in Amsterdam. So they in will need an extra will need to pay extra.
But of course we will understand better if we could get the WGs in this forum to contribute to this discussion ....