God, nature, evolution, random life ... whatever you want to call it has a weird sense of humour to make men's cock hole be the same hole piss and cum come out of.
It's a complex physiology, biochemistry, psychology, neurology etc. Sometimes it's bound to go wrong. I am surprised it doesn't happen more often.
With women the vagina and the urethra are totally separate holes, which totally makes sense.
But even then there is still dispute as to whether the girls are pissing or cumming.
In most squirting pornos you see where the girls squirt 2 metres distance the girls are definitely just pissing.
And some girls when they get horny and fingered and fucked just lose control of their bladder and piss. But some girls actually do squirt. I have seen smelt and tasted it and it is not piss. What the fuck it is and where this juice is stored is still a mystery.
Basically medicine for the last 5,000 years has been by men for men. The clitoris was only fully mapped around 20 years ago. Even gynecologists are still pretty clueless about womens bits, so what chance do us mug punters have .
We just finger, lick, poke, rub etc and hope for the best