If one responds "yes" to the 1st question, then the response to the 2nd question should probably be "will shower at beginning of visit". If one responds "no", then the response should probably be "will shower prior to visit".

I always asked to take a shower after I arrive and before I leave the date. I even state this in the "other information/bio" section on my profile.

I am unfamiliar with the inner workings of P411. But maybe some guys are members of the Polar Bear Club and want to shower with ("shower preference") ice cold water? Or maybe a manatee who needs ("shower preference") a nice, slow, warm, lingering shower?

Shower alone or together.

In the summer, I usually volunteer to shower shortly after coming in and exchanging greetings. I always take public transit to my incalls, and as we all know, trains are filthy.  Plus, I'd be cuddling with the lady skin-to-skin shortly after sitting on dirty train seats.  So showering promptly seems like the right thing to do.

In the winter, it depends.  Since I wear a jacket or coat, which I remove upon coming in, I'm not cuddling with her in the same clothes I traveled in.  So I follow her cues.  If she "offers" me to take a shower, I take it as a cue to do just that.  If not, no big deal, since I always shower at home before I head out, anyway.

One time I was with a provider who told me she had contacted another lady I had seen for a reference and when I asked what she said, she told me that she said I liked to take a shower first.  

I didn't think that was unusual at all so it kind of surprised me that this was what she remembered about me.

I ended up figuring that they shared other information too. What else would possess a lady to start the session by sitting on my face without even asking if I would like it?

I did, of course.