eli5: What cause a pee stream to sometimes split into multiple different streams?

Question

eli5: What cause a pee stream to sometimes split into multiple different streams?

In: 12

Answer 1

Reflux is the reflexive action of the detrusor muscle inside the bladder, which contracts for a brief period of time to help return previously ejaculated seminal fluid to the bladder. This causes a split when you try to pee after, as the seminal fluid and urine fight for passage out of the bladder simultaneously.

Source: Have ejaculated then peed.