Why does this happen when you go to the toilet?

Question

Can anyone tell me why you do number 1s when you're doing number 2s?

Answer 1

You ... release the same muscles that control both bladder & your other excretory systems?

I dunno haha =)

Answer 2

Probably because in doing no 2 you feel relief and it relaxes the muscles for no 1

Answer 3

When you use your rectal muscles it also uses your urinal mascles too. I think it's becuase it's the same part of the brain that controls both rectal and urinal muscles, and it might accidentally use both at once.