most chicks i've dated aren't into it. some don't care.. and some actually enjoy it. just depends.
i don't see why providers would be any different. i never want to do something they are disgusted by to them so its a bigger turn off for them to take a facial or CIM and hate it than it would be for them to just tell me upfront they don't like it.
you want smelly cum? drink coffee, eat a steak dripping in spices beforehand. you want sweet cum? then pineapple juice and fruit beforehand (peaches are great too)