Dad's rules were girls do their business inside but boys always pee outside.
He worried about the septic system - and then again I think he might have just wanted some of that nitrogen to be recycled.
Peeing standing up is an ongoing source of frustration and complaint for my wife.
As soon as our boys were potty trained, they both took to peeing outside. I was a little boy once, so I knew there was little chance of getting them to stop. It wasn’t even something I showed them, but I definitely got blamed for it. Mom was 100% not a fan.
So, we had to come up with some rules. First rule was “don’t let mom see you doing it.” That worked ok, they started going behind the garage but the neighbor lady sometimes saw them and told their mom.
Second rule was “dont let the neighbor lady see you doing it, she spies for mom”. They were pretty good about following that rule.
They don’t pee outside much now and they are actually fairly well trained to lift the seat when they pee (and usually even put it back down). But, they still miss and get pee all over the rim and sometimes the floor. It drives mom nuts.