why do men do that shudder after they pee?

Question

ive not notced it in a woman either but then i usually dont stand there watching them pee, honest.

I dont know why i sometimes do it, it just happens.

Answer 1

One theory is that the autonomic nervous system (ANS) is the cause. When you have to pee you hold it in, the longer you wait the tougher it is to hold in. You ANS is sending the signals to your bladder and urethral sphincter to hold that pee in at all costs, when you finally do pee, your ANS allows the relaxation of the urethral sphincter and the flow to begin. This switch in the ANS is thought to be the cause of the shudder or pee shiver. The longer you hold it in the greater the pee shiver will be.
When you pee you are expelling a fairly warm liquid. A regular shiver is the body trying to keep warm, perhaps the loss of a little hot water bottle causes a drop in body temperature and thus a shiver is produced to recover some of that lost heat. That doesn't quite explain why you still shudder in a heat wave, but then body temperature regulation is probably not an easy assignment.

Answer 2

Its the spontaneous contraction of the urethra which signifies the stop the urination process, for some men it just amplifies the contraction to a visible shudder of their bodies... it is as simple as that....

Answer 3

I dont know why that happens, I was just talkin about that the other day. Maybe because youre releasing something from your body and you just have a tingle.