When men pee, are we just allowing the pee to flow out or are we subconsciously pushing it? Also, when we do push it, what’s happening there?

Question

When men pee, are we just allowing the pee to flow out or are we subconsciously pushing it? Also, when we do push it, what’s happening there?

In:

Answer 1

Since humans can pee upside down and even in zero gravity, it stands to reason that something more than gravity is at play. Since we can vary the flow of urine at will, that means the thing causing the flow is under voluntary control – in other words, muscles.