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You'd think it'd just be pressure receptors inside the bladder, but we've gotten a few interesting case studies from astronauts who report urinary retention in zero-g.
Your bladder is just a muscle-bag that stretches and collapses like a balloon depending on its volume, so pressure from the urine wouldn't change much in zero-g vs normal g.
Makes me wonder if the receptor that triggers the need to pee is under and completely separate from the bladder, activated by the downward force of a heavy bladder laying on it.
Easy enough to test: if you need to pee, hang your torso off the side of the bed or do a handstand or something so the gravitational force on the bladder is reversed -- did the urge to pee go away?
https://pubmed.ncbi.nlm.nih.gov/17511293/
Have you used, for example, one of those camp showers? Water is heavy. Gravity builds up pressure fairly quickly, and it's going through a pretty small pipe.
Speak for yourself
Urethras are all narrow, regardless of their enormous meat casing, n'est-ce pas?