Id say literally 80-90% of AMP ladies will do them-Sometimes they pretend to be shocked and then go ahead and do it like they have done a thousand of them before. just ask them before you pay-the girl not mms- If no, walk
I havent met any in USA honestly... another annoying issue,,, Ive been with a few providers in tokyo, who do GS, when Ive gotten comfortable enough for personable friendly chit chat, the few I asked, said: they will do them but dont enjoy to. This is my take away... those that do give, do so, but dont enjoy.
Id love to meet one which actively enjoys giving,,, or even finds it sexually exciting for them...