And when it comes to older brothers -
which is actually quite common
I think perhaps, horny as they are at that age, they aren't thinking of anything but getting the rocks off.
Guys hanging out and comparing is helpful. They will eventually move past the typical games of who can cum first, who can shoot the farthest, or the most.
So, guys, if you want to improve your game, find a buddy or a group and learn from one another.