I went on a school trip to Finland. I was staying with this family with a son the same age and on the first Saturday they look me to the local swimming baths. The father, son and I went into the men's changing room and they both undressed and stood there naked. I immediately noticed that the son had very few hairs and then when they said ‘hurry up, we’re waiting’ I suddenly discovered they were expecting me to do the same which, as a very self-conscious teen boy who had never really been seen naked outside of school, was completely unexpected. They’d already remarked on me having really hairy legs and hairy pits and I was thinking, that’s not all that’s hairy.

When I finally mustered the courage to take off my underpants (desperately trying not to get a boner) although I still had no idea why, they both had a good look at what had been hidden and were surprised at how big and hairy I was (the actual comment from the dad was ‘wow, you’re a big boy’) and then I discovered that we were walking naked into the mens public sauna where everyone from boys to old men were completely naked. There were two blocks of six or seven tiers of wooden benches facing each other so everyone on one side could see everyone on the other. I had no idea these were even a thing so it was all a bit of a shock. It turns out most Finns have very little body hair and it is usually quite light so they were all staring at me in amazement which didn't help with my efforts not to get an erection, I could feel it was gradually happening and I had no way of stopping it. I don't think they knew what to make of this really hairy dark-haired teen boy with a big cock lol. I ended up fully erect and despite my best efforts remained like it until we left, I couldn’t wait to get my trunks on although I struggled to get everything inside.

A few days later they took me to the family log cabin up on the foothills of the mountains and without being asked I was told we were going into the family sauna and was told to completely undress in the room I’d been shown to and then follow the path up to the sauna and meet them. I found out it must have been about 50 or 60 yards up the track and I had to pass several other chalets/cabins which all felt a bit weird. As I sheepishly arrived completely naked I realised their whole family was there, grandparents, the boy and his parents, his aunt and two cousins and a few family friends and their children, all completely naked. I think they were showing me off haha, at least that was how it felt. It was the first time I’d seen women and girls naked in the flesh, I remember these two young girls about 10 and 12 both had tits and pubic hair which surprised me and I ended up fully erect again and the grandparents weren’t impressed but the lad’s dad said I couldn’t help being a big boy. I got lots of comments about being hairy and having a large cock and they actually asked if they could take a picture of me but I declined lol.

Afterwards I was asked if I wanted to join them jumping into the lake, but I was told the water was very cold and deep so I declined and had to walk back to the chalet naked with my still erect cock waving in front of me