You enter the space, first thing out of her mouth is "shower?". She's not starting light conversation, she's going through the tried and true script. She knows almost every guy is going to follow the script. Both of you get scrubbed up. All of the secret acronyms follow on the bed. She may have 10 more appointments that day, she knows she is going to likely have a shower when the next one arrives. While you are dressing to leave, she throws on the robe, bids you adieu, and she may, or may not, jump right into the shower, knowing shes taking another one with the next client in a few minutes. If she does wait, and you walk in proclaiming your stellar hygiene and no need for a time wasting shower, you're enjoying the closest thing to pulling a train as possible.
An old board which is defunct had a monger whose handle was hilarious, it was Howdmydicktaste