Whoa! What a crazy question. But I'll jump in and go along.
As best I can determine, the fun of peeing outside seemingly crosses both socio and economic boundaries. When the Mister and Missus come home late at night, she dashes for the house but the Mister goes directly to his favorite tree.
I was outside one night with the Great Danes and accidentally interrupted him. But he went about his business and mentioned "What an amazing moon we have tonight". Never mind he was drunk and no moon in sight - except maybe his.
Miss Helen and I worked in a five-star hotel once where the general manager would take his young son out to the balcony of his penthouse apartment and teach him how to pee into the bushes below.
But I honestly don't think this is a gender issue at all. In fact, I have some female-gender friends in Colorado, the out-doors type, who can go behind a tree as good as any guy!
As an experienced traveler on four continents, I think America is the only country on earth that forbids peeing outside, with fines and jail at stake. What's that all about? Something to do with our Puritan background, I guess.
In any case, to those asking this hysterical question, I hope the answer's been fun and somewhat informative. I certainly had fun writing it!
Thanks for reading and stopping by tonight,