I remember an occasion when I was 12 years old when we the family were on a camping holiday in Cornwall.
We had all gone to the beach we would normally find a quiet cove to use but the tides were wrong so had to use the busy main beach.
Anyway we set out our towels and set about changing into our swimwear, I got undressed and then looked for my swimming trunks but could not find them in any of the bags. My sister started laughing and said she had left them in the tent as a joke.
Well I hadn’t worn any pants under my trousers and I wasn’t going to spend the day on the beach wearing trousers so I just stayed naked, after all I had been sitting there on my towel naked looking for my missing trunks so all around could see me anyway.
This did cause some excitement around the beach especially amongst the girls as I I had reached puberty and my pubes were just showing around my cock and balls, and for a long time able to get an erection which did happen there on the beach seeing lots of girls in their skimpy bikinis.