Nah, lol. We may sometimes just go like: "soo, how big did you say your dick was?". Then they will respond with "it's like 16 cm". And we will say "lmao loser, I'm 18! yissss".
Have heard of it from very few that have done that in their teens and early 20's to compare size. otherwise not really. not even observed that behavior IRL.
We don't. At least most don't. I'm not aware of anyone ever looking over.
Guys generally try to avoid standing in the very next urinal. With urinal etiquette. There needs to be at least a one urinal spacer. Except when in a very busy restroom like at a bar or airport requires the spacer urinals to be used. Also etiquette is generally to have as many spacers as possible. If there's twenty urinals and none are used. The first guy will go to one end. The next guy the other end.
Mostly guys just look down or straight ahead. Trying to forget anyone else is there. Talking is rare too. Mostly it's just go in, pretend that puddle you're standing in is water, wonder why a paper towel is in the urinal, get it over with, wash your hands and get out.
Do what... check each other's junk out? Certainly not like what's shown in the picture! Maybe a glance in the locker room or shower but hopefully, no staring...
Superb Opinion