When a provider asks to take a shower before she leaves, do you ask to join or allow her privacy?

I’ve never minded taking a shower with clients, but some providers prefer their privacy.  It depends on the provider. You would have to ask. The worst that could happen is she says, “no.”

... is to shower at the beginning of the session.  I love showering with my partner but at the end of the session there may be restraints as pointed out.  If you really would like to have one, suggest doing so at the start of the session.

So I wouldn't ask unless I knew her well, but if she asks, I am all in.

by saying something like:   OK, if I shower first?   Or they may say:  Why don't you shower first since I take a while.

OK, I am going to be completely honest with you on this one, someone is always going to be out of the water and cold!!! I did this a few times with my first husband and it sounds like a lot of fun but does it is challenging.  
I *do* offer bubble baths, which I think are more relaxing and fun, and then we both just rinse off at the end. (Also does not ruin my hair or makeup, which gals can be concerned about!)

If I feel like I need a shower or if I’m still alittle “frisky” I’ll ask.
I’m usually pretty good at reading the room.
I’ll never assume and just jump in

seeing how she's prepared herself for me afterwards. Unlike the fully clothed greeting at the door, my time in the shower will allow her to set the mood on the bedroom with lighting, music, and her attire (if any!)

I don't like showering with someone else.  One of us has to stand in the cold (not under the nice warm shower stream.)  When I take a shower I crank it up nice and hot (my shower has a 110F limit.)  No way I want to be in some cooler stream, and especially not with someone else hogging the stream.

Plus it's a sweet way to say a little goodbye before I hit the road. I'll shut the door if you're not allowed to come in

is one of the things I enjoy most, not to mention that it's the best ice-breaker there is when seeing a new provider for the first time, watching a provider taking an after-shower does not do much for me.  The way they thoroughly clean their business equipment is not particularly graceful, so I'm happy to wait in the other room lost in my own thoughts of how great the sex was.  

Sounds like you are talking about an outcall.

For the logistical reasons mentioned.  Particularly in my case.  I'm typically taking a session in a hotel room and I'm a big guy.  I tend to take up most of the available space in a typical hotel shower.

Best ice breaker in my book too.
In the farewell shower the playtime usually continues, it's when I get out to dry, I pull the curtain closed and that's when she takes care of her personal business^^!

Some women WANT to shower alone afterwards .They don’t want to chance getting their hair  or makeup getting wet or messed up. Maybe they have another appointment to attend too.
Guys could get alittle too playful in the shower.

Unless the shower had multiple heads, one person will be warm the other chilled.  Before downsizing I had a shower with a head on each end of the shower box.  Spectacular.

95% of my sessions are at the provider’s incall, so I am the one leaving.  I always take a shower after a session, and if the provider joins me that’s great! At that point it’s usually very close to the end of the session, so it’s a quick clean up and out!  I’m thinking clean up and out, not sexy shower.

Quite the hips

I get way too cold showering with another person and I'm not cute when I'm cold. I'm extra feisty (bratty), riddled with goosebumps, and my teeth chatter uncontrollably. Nightmare fuel for sure.

I do shower sessions, but it'll cost you

Something to hold onto while you struggle to breathe