Maybe she thinks you are gross and will contaminate her bath supplies and linens unnecessarily? She already has to do the deed why should she have to have you sully her CLEAN space?
Originally Posted by HobbyTranslationService
It's her place of business where customers are paying hundreds of of dollars per hour to come to her.
I've never heard of any business where the bathroom facilities are off limits to paying customers.
At $250 - $300 per hour she can change a fucking towel especially if he's willing to shower on the clock. No reason in the world she couldn't join him and make sure he's clean in the process.
As others have stated if she doesn't want him in the bathroom yet she's willing to fuck him there's something extremely suspect going on.
I seriously doubt she's more concerned about a damp towel than fucking a nasty smelling client.