Many people (including myself) do not defecate and urinate simultaneously, but rather in succession. Only after one is completed, the other commences. I have noticed this in myself, but the internet suggests this is neither unique nor universal: for example, see quora, reddit, grasscity. I don't seem to find any references explaining why people would be unable to do both at the same time.

  • $\begingroup$ Why the downvote? $\endgroup$
    – gerrit
    Jun 8, 2017 at 18:00
  • 1
    $\begingroup$ Probably because we don't deal in personal health questions here. I usually just vote to close in those cases, and usually leave an explanatory comment, but people are free to downvote as well. $\endgroup$
    – Bryan Krause
    Jun 8, 2017 at 18:51
  • $\begingroup$ @BryanKrause I see. I never intended to ask a personal health question but I can imagine why it may be perceived as such with the personal introduction. I have reformulated it to be more generic. $\endgroup$
    – gerrit
    Jun 8, 2017 at 18:58
  • 3
    $\begingroup$ After the edit, this does not appear like a personal medical question. I recommend reopening. $\endgroup$
    Jun 15, 2017 at 4:52
  • $\begingroup$ Something related to increasing pelvic/abdominal pressure during urination mandates external sphincter to contract simuntaneously. $\endgroup$ Jul 24, 2017 at 22:25


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