Up until I was seven years of age, my father, who was a lifer in the military, was typically stationed away from home. The people I spent the most time around were my mother, my two sisters, and my grandmother. I don't know whether it ever occurred to them to have me urinate standing up; in any case, they never brought it up, and I never perceived a lack. To this day, if a reasonable toilet is available, I tend to sit. Kind of makes sense--if I have to urinate
and defecate, I sit, and I don't necessarily know that I have only to urinate, so why not--just in case--kill two birds with one stone?
Of course, my father did at length come home to stay, and, among other things, he taught me the Standard Method for Those with Penises.

Seemed pretty odd at the time, but I learned it more easily than I did tying my shoes (don't ask

). It still isn't entirely second nature for me, but it isn't exactly brain surgery, either, and it does come in handy under a fair number of circumstances.
Usually how much I make a conscious effort not to stand depends upon how dressed I am, except in the case where I'm wearing hosiery. If I'm wearing pantyhose or tights, I have strong inclination to stand up--I suppose I'm just worried about wear and tear on the garments (if I recall correctly, I've got some Scottish ancestry

).
I suppose I'd be more strict about sitting down, but then I read that interesting stuff at
restrooms.org. It's nice to know that women can also stand, if they care to do so.
Yours,
Celia