I was spending the night in one of those pretty fancy tent rentals in Yosemite one time (this on was at white wolf, so not even one of the ones away from the road) with a woman I was hanging out with at the time. There was a small wood stove provided, but it was pretty cold before I got it stoked up, and she didn't really have any long underwear, and was freezing. I had an extra pair of patagonia tights that I assumed would be just the ticket, and offered them to her. When she saw that they had a fly she refused to wear them. She would rather freeze than even put on long underwear with a fly. Anyway, that was the moment I knew she wasn't the girl for me. LOL Too high maintenance!
So not only you Delmar!
Still they do seem very old fashioned. I can't remember the last time I used one. Rather than being a convenience they seem, um, kinda fussy and awkward to actually use. Possibly I was inadequately potty trained in my youth, but I am as likely to make a mess of it as not attempting to make use of one. And what do they protect when using it anyway? The most sensitive stuff gets exposed to the elements. I think they are like the marble Greek temples that maintained stone representations of the features of the old wooden temples, like the places where the wooden cross beams had been, 500 years after the last wooden temple - just cause that is how it was done.
I've also had a pair of tights with an additional rear "fly", and not the old style huge buttoned flap grampa had in his long johns. It was the same "mazey" design as briefs, just bigger and in the back. What's with that? If I can't safety use the front one with equipment that can write my name in the snow, why in the world would I try to use the rear fly?