It was 1966.
I was 16 when this happened and the PE lesson was coming to an end. We were practising diving that day. I dived into the pool, the drawstring was not fastened tight enough so off they came off and I didn’t know, then about 40 girls from another school entered the pool area, I swam to the poolside and climbed out of the pool, yes you guessed it, everybody got a good luck at my parts and my butt, I also had a tan line and my butt was pale. I got out of the pool, walked away from the edge of the pool, the rubbed my eyes and pushed back my hair. I spent about 10 seconds looking around to find out what everyone was laughing about, then I looked at the girls in the pool. I put my hands down to pull up my swimwear and realised I had nothing on. It was about 40 seconds from when I came out of the pool till I realised I was naked. I covered my bits immediately and I looked around the pool for my swimwear and when I found nothing I ran to the men’s changing room. One of my mates was sent to retrieve my trunks. The PE master was not best pleased since nudity in front of the opposite sex was not accepted, he thought I had done it on purpose he called me an exhibitionist. I told him it was an accident and tried to explain but he then decide that 6 whacks with the slipper was not enough and gave me 12, ouch it hurt, after the spanking my friend who had retrieved my swim trunks handed them back to me, with a grin on his face, probably because I had started to get an erection, which most of my friends watched. My mates where laughing during my punishment and when they saw me come out of the water naked . Most of the girls were laughing and giggling, as girls do. It was so embarrassing.