One day in early autumn about 20 years ago, I was on a bus. Then a conversation between two young ladies was heard. One of them said, "I went camping this summer with our group." The other said, "So, you were seen naked by lads, weren't you?" The first lady replied, "Maybe. In the morning a lad pointed his front side and said to me, 'Look at this. This is the proof of my vigor.'" And both of them chuckled.
Having no experience of camping, I do not know why lads can see ladies naked in camping. Anyway, I thought that this was not the kind of talk to be made in the public vehicle. The ladies' voices were however so fresh and innocent that I liked their conversation after all. When autumn comes, I often remind myself of that private talk between the nymphets.