Man to Man topics

When I was a kid, my father had no problem being in his briefs around me, but always asked me to leave the room and shut the door if he had to change clothes or get naked for any reason. He never allowed me to see him naked and always gave me the same amount of privacy, never seeing me naked after the age of 5 or so. While I appreciate him respecting me and giving me my space, I wonder if he went too far in that extreme of personal space and privacy.

I remember from a very young age (maybe 4 or 5) being very curious about the adult male body as well as the adult female body. I can't say I was attracted to either, necessarily -- I was just curious about what people looked like under their clothes. When I was about 10 or 11 years old, I discovered I could look through the keyhole in the old-style doorknob of our bathroom door to see into the room. That night when my father came home from work and my mother was downstairs, he went upstairs to take a shower and I snuck over to the door and looked through the keyhole. He was still in his underwear, but when he pulled them off, I was surprised that I was actually seeing my dad's penis! It was real! (haha!) And when he finished his shower, I watched him get out and dry off and get dressed, all in the bathroom. I watched him do this routine many times, both in this house and in the next house we moved into, until I was about 14 or 15 years old.

I'm not sure why I was so curious, but by the time I reached my mid teens, I was watching porn online a lot and lost interest in seeing my dad naked. But when I was 19 or so, I had stopped watching porn (and was glad I gave it up) and was once again curious about seeing other guys nude. This interest never really went anywhere and I wasn't going to start spying on my dad again, but a few years later I joined a gym and saw guys naked in the locker room all the time. That's not why I joined the gym, of course, but it was an interesting aspect for me.

Now, after seeing my dad naked (which he still doesn't know about) and having experienced the gym locker room, I'm not as curious about male nudity as I used to be. I'm straight and happily married and male nudity holds no sexual interest for me, but somehow being nude with another man, especially if he is my friend, means something to me. It's something important, I think, as if by being nude together he's telling me that he is open to me, he trusts me, and wants us to know each other better and be comfortable and confident with each other.

Now here are my questions:
1. What does male nudity mean to you?
2. Were you curious about adult male nudity when you were a kid?
3. Whether yes or no, why do you think so?
4. How can we help other boys and men become more comfortable with male nudity in a proper context and stop always seeing it as something sexual or gay?

Thank you for your responses!