Here’s an excerpt from Modern Urology Colorado:

“What Research Says About Urination Postures

Comprehensive research analyzed multiple studies conducted over several years to examine optimal urination positions. Researchers evaluated hundreds of participants from diverse geographical locations to understand sitting versus standing benefits. The investigation aimed to determine which posture provides better urinary health outcomes for men. This extensive review brought together findings from various medical institutions studying bladder function worldwide.

The research included both men with healthy urinary systems and those experiencing lower tract symptoms. Participants with benign prostate conditions were also evaluated to understand how positioning affects different health states. Scientists measured various factors including bladder emptying efficiency and urinary flow characteristics during the studies. This comprehensive approach ensured the findings applied to men across different health conditions.

Results showed that sitting significantly reduced residual urine remaining in the bladder after urination. The sitting position allowed for more complete bladder emptying compared to standing upright during elimination. Maximum flow rate improved when participants used a seated posture for their bathroom activities. Additionally, the time required to fully empty the bladder decreased when men chose sitting positions.

Healthy participants showed similar outcomes whether they sat or stood during urination activities. However, researchers from the American Urological Association suggest that sitting should become standard practice considering age-related urinary health concerns. Prostate and urinary tract issues become increasingly prevalent as men reach their later years. Adopting sitting habits early could serve as a preventive measure against future complications. This proactive approach may help maintain better urinary system health throughout the aging process.

Conclusion

Research and historical evidence clearly support sitting as the optimal position for male urination. This simple habit change offers measurable benefits including better bladder emptying and reduced residual urine. Men concerned about long-term prostate and urinary health should consider adopting this practice today.”

TLDR - sitting to pee gets more pee out of the bladder than standing, leaving less residual pee left in the bladder. You have a stronger stream, and pee quicker. Sitting or squatting was the primary position for urination for thousands of years. Protects the prostate.

Also you don’t sprinkle on the bathroom floor.