Nope! 
Not really. If you hold on to the washcloth bar, you can catch yourself when your knees buckle.
Girls really do get the best toys.
We had a similar problem when I was in college. I lived in a residential hall on a floor with 29 other guys. Our RA took charge and posted a sign on the bathroom door entrance, as well as on each shower stall door:
I don’t know if the culprit(s) ever stopped or not, but I know on at least one occasion, some dude was doing the deed in the stall next to mine. I assume that was the case, anyway, because of the way he was standing against the partition (based on his feet), the heavy breathing, and the shaking of the partition. shudder
But I don’t have a bar, and last time the shower curtain rod . . .
. . . er, never mind. You girls do what you want - I’m staying flat on my back, thankyouverymuch.
For a number of reasons, not least being klutziness, I prefer to lie down to abuse myself.
Being thirteen and trying to answer, ‘How did you do that to yourself?’, while being driven to the doctor’s office for stitches really does a lot to impress on a person that showers and masturbation are a bad combination.
Hubby’s told me in the past that wanking in the shower just results in a fistful of horrible, sticky goo.
Both he and my best mate have confirmed that Jizz + water = something that’s like silly putty, only more horrible.
And I’m a girl who doesn’t like standing in the shower to do it. I’m a knee-buckler, so I fall down. Lying’s my thing.
Lather.
Rinse.
Repeat.
It’s not just an instruction set, it’s a way of life
Before reading this thread, I had never in my life bought conditioner, or thought I had a reason to.
Do you live in a mansion? What other type of house has 10 bedrooms? Aren’t there laws limiting the number of unrelated people can live in the same house? Eek I would hate having to share a house and bathroom with 9 other guys, that’s just horrible.
I find that doing it in the shower arouses a great fear of slippage, thus ruining the fun.
No, no, no. It’s rinse, lather, repeatrepeatrepeatrepeatrepeatrepeatrepeatrepeatrepeatrepeatrepeat…
ETA: and yes, water makes jizz much much more difficult to get off things, like hands and drains and such.
Speaking as a male, I find the shower is a great place for … personal amusement.
I don’t have to worry about lube - I still have a foreskin, and as for the drains, that isn’t a problem…
the people walking past the window on the other side of the bathroom, however, do have a problem 
I say that it’s the pigeons.
Si
There should be an episode of Mythbusters about this thread,
Nope. There are occasionally balance issues if the “finish” is exceptionally intense, but no problems getting there. I will agree, however, with those who’ve said that the shower is not the optimal location: hard surface, uneven temperatures, lube issues, etc. It’s definitely not impossible or even very difficult, though.
Although my first thought on reading the OP was that you weren’t dealing with semen, but snot. The humidity of a morning showers tend to suddenly loosen up everything from throat to sinuses, and a regular smoker or someone with a head cold can produce volumes of drain-clogging snot that would put Ron Jeremy to shame.
You got that right!
This wasn’t directed at me, but just for fun: in university, I lived in a house where the landlord+lady lived on the main floor with their 2 (later 3) children, and rented out 17 rooms in the upper floors and basement to students. Mind you, there were 4 kitchens and 6 bathrooms for the lot to share. The house was a former convent that had originally been built by the Lieutenant-Governor of Quebec in ~1890, as I recall. Believe it or not, it was pretty quiet in the house most of the time.
What’s the problem with dandruff shampoo? What am I missing here?
Note to self: When Dopers are kind enough to include the initials TMI in a thread title, it usually means there’s stuff in there even your twisted, dark excuse of a mind can’t handle. Just move on, dumbass.
eeeeeeeeeeeeeeeeeeeew.
…thinks about better response…
I…
I…
eeeeeeeeeeew.