A story about NOT showing it off.
In South Africa, I joined a jeep tour as a single - the jeeps held ten. The company matched me into a group of six Americans and two Canadians. One of the Americans was a 20-something young man. It happened that that guy and I ended up on the same piss schedule consistently. We stopped every two hours out of a 12 hour jeep ride. Sometimes, I needed a piss and it seemed he always needed one too. The facilities ranged between pissing beside the jeep in the bush to restrooms at comfort stops in the national park. The restrooms were usually open trough or undivided urinals.
On our first two stops, I took my place first and he went into the stalls. On stop three, he took one end of the trough and I went down a distance. His left hand stretched up and down in front of his fly, trying to hide his cock. It looked funny and then I realized why. His foreskin stretched beneath his finger. so, it looked like his middle finger was pissing. I cracked up laughing. He turned to me and went, "What?!"
The next stop was out in the bush. I strode out behind a bush. He followed me. Once I started pissing, he ask, "What were you laughing about back there?"
I told him about his pissing finger and he laughed. "Dude, you don't have to hide it," I said. "If its longer than your finger, you should be proud of it. See, I don't care who sees." I turned toward him, giving him a nice view of my meat.
Next stop was at lunch. The trough was shoulder-to-shoulder. Only one stall was available. We ended up at the stall door at the same second. I had the best angle on the door, so I got a shoulder in. "Man, I gotta go," he said. "I don't mind sharing," I answered.
We took opposite sides of the bowl and unleashed. He was still shy, trying to hide it behind hands and failing. "Dude, that's a beautiful one," I said. "What smaller than what I see in porn," he said. I laughed. "Don't believe the porn. Those guys are super big. You're just fine."
We pissed together for the rest of the trip and he was unashamed.