I can't recall an outcall asking for a shower. Often they ask to use the bathroom for a freshening up.
Meaning, a wee and a wet wipe...
Afterwards, I always offer a shower but they rarely take it up. Prefer to rush home I guess even if they're smelling of sex.
...or smell of durex / strawberry lube. I suspect they have to work up a slight bit of interest to smell of sex, which of course many of them consider “unprofessional”. I think the “rushing home” bit is usually part of the fantasy. Unless it’s a dusty phone job she’ll usually try to book appointments with google-estimated travel time in between.
The one time I can remember a slightly frustrating “bathroom time” was a regular who wanted to “get changed” into some daft outfit as a treat. Maybe ok if you were into it or had requested it but otherwise the kettle definitely goes off the boil. There was no charge for it though.
Of course, if she’s a right slag (Derby outcall comes to mind) she maybe wants to luxuriate in hotel toiletries for five or ten rather than cold water in her shared squat or whatever palatial residence she’s used to.