I think you'll find what constitutes a "fetish" is very much an individual's personal preference. I can't find the post (it may have been on another web site), but I spit coffee and LMAO when a provider posted a while back looking for support and validation.
She complained that a new client asked for a "fetish upgrade" that she didn't agree to. When people responded and asked what fetish this client asked for (inquiring dirty minds wanted to know), she replied, "He asked for doggy position and didn't want to pay the upcharge donation, so I threw him out."
I tactfully replied that she might want to consider another line of work....