I usually undo my fly when I pee.
Because if you’re wearing both underwear and pants, there are two flies, so I guess the idea is that you use both or neither.
Honestly, growing up in the loose clothes, big pants 90s, I was a “neither” guy. Just used my thumb to lower both waistbands at once, just enough, and things worked out fine.
Now I’m older, a professional, and I wear dress clothes, so I use the flies. Both of them.
Okay; ignorance fought. I couldn’t figure how you’d pull the waistband down without also undoing the trousers waistband. I also still can’t figure how you’d pull the elastic waistband up again.
I guess it’s like whether the toilet paper unrolls over or under the roll: the way you do it is right…for you!
No unbuckling anything here either – unzip (or unbutton if button-fly), reach in, (optional: push aside shirttails), pull down waistband, vault the Man Of The Moment over the now lowered waistband, do my business, reverse process. (Garment preference datum: “boxer briefs”, in shorter length.)
That said, I’ve noticed there are variations in the underwear fly design that make some more user-friendly than others for “excuse me while I whip dis out” management. One particular set I purchased years ago was a bit too efficient and would repeatedly allow the Guest of Honor and Honorable Companions to escape into the space between inner and outer garments, and that is not a malfunction you can clear without those around you noticing. Needless to say they were promptly replaced by more reliable gear.
It’s elastic. You will gave pulled down the front of it, but the back is still up, prevented from following down by the existence of buttocks and being in tension, so it will spring back up. When the waistband will no longer want to spring back up, it means it’s time to replace.
I’m peeing now.
ETA: all done.
I haven’t worn underwear with a fly since my mother stopped buying it for me.
As an historical guess, I’d say the fly dates back to the pre-elastic era, when underwear had a button or stringtie, and it was hard to pee over the gunwales, so a fly was added .
Because the fly in the undies doesn’t align with the zipper in the pants. I’d have to fumble around in my pants, trying to find the fly. Much easier just to pull down the waistband.
I bet there is a direct correlation between men who use their flys (plural, undies and pants) and men who stand up to wipe. A Venn diagram, if you will. 
I’ve been thinking exactly the same thing.
It doesn’t matter if you use the fly or no, it doesn’t matter if you like it or no. You are a man, you have to wear briefs, boxers, …… with fly. Without fly, you are wearing panties for women. What do you think about man wearing bras?! or even wearing T-shirt for his wedding or his formal meeting. Please be real men and wear shirts, shoes not flip flop or sandals and wear briefs with fly. Ask your girlfriend and she will tell you that she would like see you wearing as a real man. Indeed how can you use the opening in your pant if you don’t have one in your briefs?. Fly can’t be optional, it should be mandatory.
I always use the fly…and always stand up to wipe. Older generation.
Now explain this. My father always wore boxers. I disliked them and have worn briefs ever since I was old enough to buy my own. My sons both wear boxers.
Styles change.
I was harassed quite a bit in the 1970s in junior high for wearing boxer shorts. Becaue no one (except unstylish me) under the age of 35 wore such things.
Well, OK, I wasn’t so much harassed for wearing boxers as for being me and it was something odd that I did for which they could direct additional teasing. But it was a tease-worthy item of peculiar conduct at any rate.
Now all the young kids (by which I mean males under the age of 35 or so) seem to prefer the boxer shorts.
ETA: If a zombie were reincarnated from the 1950s he’d be wearing boxers. If the zombie came from the 1970s, briefs.
This has more to do with the comfort while not peeing, but my preferred boxer briefs have a version with and without the fly. I noticed the fly ones are more comfortable perhaps because they are roomier by design. Also, I find pulling the waistband down to be sometimes painful and less practical as it comes to emptying the bladder and preventing spillage.
I’m so glad this thread is bumped 
I don’t have much of a preference.
I unzip my trousers, then it depends on the situation, how much I am in the hurry, and how much is an entangled mess down there. I suppose I’m pulling my waistband down 60% of the time.
I don’t get why people get so worked up about this. Like a toilet paper roll dangling - on the front over the reel or in the back? Whatever is there, I’ll use it.
I don’t care about underwear flies, but TP orientation is a whole other story!
Imagine if every time you used a keyboard, it was a different layout. Sometimes QWERTY, sometimes DVORAK, occasionally something else entirely. That’s how frustrating it is to find a backwards mounted toilet paper roll! Yeah, I can still get the job done, but it takes a lot more mental effort and coordination.
This is why we have standards. So the little things we deal with every day can be accomplished without thinking. TP the wrong way just causes unneeded frustration.
This is one very fucking funny thread!
LMAO
A true Leaffan likes the underwear choices of Adam & Eve.
I was fooled into voting, not noticing the date on the first post. In 2011, I only wore briefs and they did not have flies, so over the top or out the leg hole were the options. Mostly, I went over the top but did get occasional spray accidents when retracting. Since 2016 I’ve mostly worn boxers with abundant fly space, so through the fly is the only way. Some trousers are still too tight to use the fly alone, so they get unbelted, unbuttoned and unzipped before using the fly in the boxers.
What, exactly, is happening in your drawers?
mmm
I don’t know, but I see he’s won first prize.