It cannot be illegal unless you do somethig illegal, like oganised prostitution, drug taking.. and countless others.
I assume it is a house visit, so it is private, not in the park, and if a bunch of women are happy for a man to come round and teach them how to improve their sex life, all I can see is that the company would qualify for financial support from the government (pun intended, lol) or they can even register as a charity (seriously!!!), because good sex life at home leads to stable families, good morals, less rape, happy employees at work , the economy benefits, who knows , it may be way out of the economic downturn!
Hey, Happy New Year everyone!!!
Otherwise, all I know is about strippers for hen and stag parties, tantra visiting massages, escorts and the like