Seeing people you know nude at the gym/sauna

A few years ago my wife’s father who’s in his 60s joined my gym after he had a heart scare. I’ve been with him naked in the showers and changing rooms many times now and it’s a really great bonding experience. We can chat away and we seem to get on even better now. FYI I’m an average sized uncut Englishman. He’s certainly bigger and heavier hanging than me, but I’ve never been shy in front of bigger men.
 
When I was a student, there was a special situation where a group of boys squeezed into the same small cubicle to take a shower together, which left a deep impression on me.
This was the first time that everyone was so close, allowing me to observe their cocks. I felt like I was the only "shower" present, and they were all "growers", although I didn't know how big their cocks would be when they were hard. But at least when it's soft, I'm above average, and since then I've gained a little confidence in my dick in naked situations.
After seeing the experiences of some teachers, I also feel that it is terrible for students to see you naked. No matter what your figure is, you will become their public gossip and topic.
I am not an exhibitionist and would be embarrassed if a fully clothed person who I knew but whom I had never seen naked saw me naked.
I think friends or acquaintances who have seen each other naked can quickly build friendships.
But seeing each other naked with someone you know but don't know well can be very uncomfortable.
 
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