scowls Why do you want to know?
I very rarely pee indoors. When nessasary I unbutton and unzip. One hand for me and one resting on the lever. I usually take a look at the next guy if there is one.
So long as it’s not “standing at attention”, I’m sure it wouldn’t bother me.
No disrespect, just curiosity, what did you think the front access hole in various forms of underwear was for then?
Okay, I’m confused now - we all seem to be talking about different things.
Okay, just read the OP again - I’ll revise my answer to “peek” but the definition of that depends on whether I’m wearing button flies or zip flies (if you’re wearing button flies you have to undo and open your trousers). I don’t think I’ve ever even witnessed someone undoing their trousers and dropping them to below groin height to pee so apologies for missing the point, I thought this was a “do you take great pains to hide your penis whilst peeing or not?” thread.
Apologies as well for my snarky reply, Illuminatiprimus.
It’s hard to desribe, but one slides down the zipper after undoing the belt, and slides the pants down till just underneath the penis, and supports the pants with one hand while guiding the penis with the other (or, if drunk, using the other to support oneself against the wall!:D)
I’d show a picture, but din’t want to use up the bandwidth. 
Q
I think I’m good without the picture Quasi 
I can confirm I’ve never witnessed this, with the exception of when you need to open your fly completely because they’re button up. I have heard of the phenomenon of pulling one’s trousers down completely and leaving them on the floor when one takes a piss - now THAT defies sense!
Peeking can be very awkward with button fly jeans. The first button is a pain to undo.
Really, it depends on my underwear, and sometimes on my pants. Most of my pants have a huge access area exposed by opening the zipper, but one set of pants that I can’t wait to get rid of has a zipper that doesn’t go down far enough. Ah, but certain sets of underwear confuse things as well. My preference is speed, meaning that when I can, it’s zipper only.
Only one of my many pairs of pants are button-fly. When I wear those, I unbuckle my belt, unbutton the fly, pull out the monster and let 'er rip. On all other pants with zippers I just unzip, pull out the monster, and aim for the urinal cake. I never realized so many guys went through more disrobing just to take a leak.
Free him all the way. Why just poke through the zipper? Seems like a recipe for disaster shudder
Also, I use two hands when I pee, just as God intended. One hand (in my case, the left, but it matters little) is used to hold the boxers elastic out of the way. I just put my thumb in, going straight down from the sack, and then slightly off to the left. The other hand holds El Wang. I suppose you can use just one, to hold the wang, but the other hand moving the elastic out of the way just makes it a little more comfy…why have it jam into the underside of your sack if you don’t have to?
Oh, and you people who don’t use either hand and put them both on your hips…knock it off! You’re not impressing anyone, so stop showing off whatever it is you’re showing off…seriously, what’s the point of not even using one hand? Seems dangerous…what if you slightly miscalculated and an errant stream misses?
Those are the guys preparing their excuse for not washing their hands.
Oh, Q. 
I think maybe we have different definitions of “groin”. I see the wiki def of groin, which is “the two creases at the junction of the torso with the legs”. Perhaps my own definition is incorrect. I’m no groin expert, I admit. I’ve always thought of it as more…southern. Meaning (rude spoiler incoming)
From the sack, south, to the navel, north
But fair enough. I’ll readmit my preference.
I pull the front of my pants down over “l’il GameHat” to do my business. Never through the fly, that just seems dangerous. But I never expose the twins.
Punchline to one of my dad’s favorite jokes: I can’t speak for the rest of the waiters, but I use these tongs.
Really, it’s relatively safe. The chances of the Mad Zipper Upper running by and zipping you up, thereby mashing your fun hose in zipper teeth, thus cutting it off and having it fall into the toilet, only to be flushed away into oblivion, are extremely rare. I’m almost 50 and have only lost 3 penises that way.
I generally strip naked.
It can be disconcerting for others in the bathroom.
But not as weird as the guys who pull it out and then put their hands on their hips in that ‘Superman looking over the city from the top of skyscaper’ pose. That freaks me out!
What do you think Superman was doing?
Why on earth do you think your trousers come with a fly? Obviously to unzip and pee through without having all the hassel of undoing everything.
Now with button down jeans then you have no choice but to work your way down the buttons but otherwise otherwise?
Some weird people out there.
As an experiment, I suggest that the next time you get undressed, you unbutton your trousers and then try to remove them without first lowering your fly – the mystery will be instantly cleared up for you. This is just one useful application of some sage advice: “Just because there’s an opening there doesn’t mean you’re meant to put your penis through it.” 
I don’t know how you dress, but with any clothes I’ve ever worn it’s much more of a nuisance to try to pee through the fly.
Zip down, reach in to the pans fly and then try to fish past your shirt tail and through the fly of your underwear, grab the little bastard and pull him out into the fresh air? Now you’re meant to pee through something surrounded by layers of swaddling cloth? How then do you clear your vas so you can put it away it without dripping into your shorts (or worse, on your pants?) You do that hopping and shaking thing? Dab at your urethral orifice with a bit of toilet paper as a former girlfriend of mine assumed men must do? Just be content to have a few drops of pee in your pants?
I tried that just now to see if it’s gotten any easier since I was a boy and I concluded that flies were not meant to be peed through. Nope, still as silly and awkward as I remember. The quick 1-2-3 of belt, button and fly is much faster and easier than trying to clear away layers of fabric and dragging my gear through the small space afforded. I got it out and then unbuckled properly so I could carry on with confidence, and still feel abraded from having my pecker come into rough contact with my zipper. Those things are called teeth for good reason - christ!
If you’re tough enough, zipper teeth are harmless. That’s why I masturbate with 60-grit sandpaper.