My Dad and I were familiar with seeing each other nude on many occasions during the 60 years we were both on this planet together -- he is now gone. We only had one bathroom and we seldom took clothing with us into it when it was wash-up time. We did have a good idea of what each other looked like. And it could be useful for it provided opportunities for asking questions and exchanging ideas -- "teaching moments", I believe they're called now.
I remember being a little tyke about five years old and my Dad coming into my room early one morning to get my bare but out of bed and start getting me ready for school. Sleepily I asked him why my litle penis was hard and stuck out in front of me like a little poker when I first woke up -- shortly it would soften and look and feel normal. He told me that my penis was just practicing for something which I would need when I got older but that it needed to start practicing now. With all the different stuff a little guy goes through growing up, that was a good answer: what was happening was OK and I didn't need to worry about it.
I think you're missing something special if you don't spend casual nude time with your sons for it can be a wonderful time of closeness and sharing.
And sometimes I'd see my Dad's erections in the morning as he headed for the bathroom. And then I'd see him soft whe he got out of the bathtub and started to dry himself off. Seeing him undressed gave me a good idea what to expect for my own body as I got older. Then when I started getting close to adolescence my morning hard penis started to get almost as big as his when hard. He then told me that at that point the practice that my penis had been doing by getting hard in the morning by itself needed some help from me -- that I would need to find someplace to be by myself and help it practice by stroking it so that my body would learn to produce the different fluids needed for me to pass on life when the time came. If the fluids didn't come right away, someday they would. And that while the rubbing would feel good I shouldn't be in a huge rush to get it over with, I should take my time. That was great advice for as an adult I never had problems with premature ejaculation. And I learned that masturbation was a simple but needful part of life - something which I probably practiced a couple times a day all through my teen years without any guilt or feeling strange about myself.
Then there were the times on family vacations at a cabin at the lake when Dad and I would steal away from the rest of the family just before sunrise for a nude swim together at the lake. We would try to beat each other out to the float and back to the shore but we were always close, often without a clear winner. My Dad said he didn't want me to beat him, but he also didn't want to think he'd raised a son who couldn't! Those times were wonderful -- the world was just waking up for a new day and everything was clear, fresh and as it had been for ages. Unencumbered by the passing swimsuit fashion of the day my Dad and I were timeless humans, nude together as he and his brother had been with my grandfather years earlier, and so it had probably been going back in an unbroken chain for ages, all the way to the hunters of old who of course had no clothes. Then as an adult I had become taller and broader in the shoulder than my Dad -- and we were both pleased and proud that my penis was bigger than his, both soft and hard. One generation should improve over the one before it, he would tell me with a grin.
manhood should be enjoyed, not proven -- gymrat44