I was naked with other males while growing up, but with females involved, not until I was living and working in Japan. It is a somewhat hilarious and weird story. I was at a factory located in the Northeast of Tokyo with two men from my Tokyo office, and we missed the last train back to Tokyo.
My Japanese from the office knew I did not like staying in the town where the factory was located, so after a while, they suggested that we go to a Onsen (hot springs resort). I agreed with conditions, such as a room by myself and a room with a western style toilet. So off we went, my two associates and the factory owner. It was a Friday night, so everywhere we went was either fully booked or could not meet my conditions.
Eventually, we found a place in the boondocks. I was instructed what to do, which was once in my room, to remove all of my clothing and put on a Yukata (thin kimono like), and they would come for me. We went to the men's changing room, where we removed our yukata and got a tenughi, which ia a small wash cloth, which is used for washing, drying and more or less for modesty purposes. I was pointed to a door which led to the bath, so off I went, with my tenughi on my shoulder.
As soon as I walked in, I bumped into someone, who was a Japanese woman attired as I was. Naturally,I was shocked. My three companions were laughing as they explained that happened to be one of the few Konyoko Buros (mixed sex bathing). Well, I decided why not, so off we went to wash prior to entering the bath. IU glanced around and noted there were about 50 Japanese women, men and children in the bath, and the area had become silent once I entered.
After washing, I went to enter the bath, and I started stepping in, and I experienced the hottest water I had ever felt, I screamed, jumped back and threw my tenughi in the air. I started jumping around on one foot, which all of the Japanese folks must have thought was unusual. Eventually, my associates explained the proper way to enter the bath, and once in, it was fantastic.
There is more to this story, which I will relate elsewhere on here.