New clients who go in for a full tongue snog almost as soon as I close the door quickly learn I don't do things that way. I pull away with a smile and direct them to the bedroom saying let's get in here and have a great time, or words like that. I then make sure the money is mine and in another room which they are not going to visit, before any stripping off or groping occurs.
I never had a man complain about this. I read of girls who meet new clients and have their trousers down within seconds of closing the front door and before payment too. Fine but it only takes one man to get away with some pleasure and then stating he forgot his wallet or not having enough money etc to upset a wg and off she goes moaning about it on a forum. It is avoidable.
With regs I have known years and a very few who pay at the end it would feel a little awkward for me to start asking at the beginning. I never quite managed to get that one right.