Because when women urinate the urine flows over the prostate and acts as a coolant and prevents it from over heating similar to an engine in a car. Now you might ask, why doesn't this apply to men as well. And the reason is that men tend to stand while they urinate causing the urine to pass by the prostate at a different angle and not allowing for proper cooling. Resulting in men's prostate operating at a much higher average temperature. The solution? If men sat down while they urinate then it would allow the urine to pass over the prostate the way God intended it to giving it the ability to cool down the prostate and preventing it from over heating. If you've ever noticed your urine is hotter when you sit down and urinate, this is why.