Corrected typos and elaborated my reply.
I used to be very shy. However, whenever I had to go I had to go. Sometimes at a gas station, at the mall, restaurant, school. Wherever it was, sometimes the only option was the urinal. I couldn’t give myself the luxury of waiting for a cubicle. I needed to PEE!!! Well, sometimes there were dividers, sometimes there were not. Either way, whenever the bathroom was full, I couldn’t look around to check but I felt the world was watching me and I couldn’t pee. I’d stay frozen for decades. Specially if a friend was there peeing too. With time it happened less.
I learned over time that we always skip a spot to give the other privacy and avoid any inconvenience.
Nowadays, I can go anywhere with anyone and I do not care. If someone looks, I let them look, and that is not expecting any sexual thing. In fact I find the idea of doing it in a public restroom very unappealing. I don’t judge who likes it tho. I also found that most guys, straight or not, will quickly look. It is sometimes involuntary. The reasons vary. I think men is competitive even unconsciously. That is just normal. However, I never heard of anyone looking and staring openly at someone’s dick in public bathrooms, unless they like the adrenaline. You may get a punch right in your face if the other person gets really upset. Some people will just go further in to hide. Or most likely go to a cubicle so they won’t show it. Most men won’t even look around to make sure other guys know they are not gay.
Me, I usually walk in and if it is visible I’ll look for a second or two. Unless the person is clearly not caring about having it visible. But I never look thinking I will get hard or that I will do anything there. It is just curiosity. Sometimes I do find the guy cute and I look even more curious. Sometimes it is just that instinct that comes unintentionally. It just happens. Either way, it is usually in a split second, and almost always looking discreetly sideways when no one is looking at me. I never got hard, tho. I think it can happen to anyone if they’re really horny and that turns them on. It doesn’t turn me on. But if it does turn you on and you are not there for fun, just ignore it. Most likely, no one will be checking to see if you’re hard or not.
The most important thing is, even if you look at someone, intentionally or not, depending on the place you’re at (there are cruising places), most men is there just to pee and leave. 99% of the time they won’t even cross eyes with you through the mirror.
The mirror is also a good place to take a pick, btw.
Anyway, just be yourself and give ppl space. Don’t be inconvenient causing others to be uncomfortable and you will be okay.