I agree - it is a pain in the arse ( if you pardon the pun

) for a girl to advertise it ( or a parlour ) and then to be declined
The thing that really annoys me is when they say " Sorry I haven't prepared for it today"
FFS - If it is a service they offer then they should prepare in advance - especially if a parlour girl
Having said that I did have a memorable experience with a regular once - we hadn't had anal as it wasn't on her enjoys list even though I had enquired several times- when I turned up she informed me that she was now keen to start offering anal and had been preparing herself for a few weeks with a butt plug to get used to it
Then she offered me they chance to be her first anal client as she knew me and trusted me to be gentle - it was certainly very difficult getting in but she admitted afterwards that she had enjoyed it - no charge either

Saw her many times after that and it was always available