I went on a trip to Japan with my classmates. We stayed at a five star hotel for a week. When I was at the sauna, most of my female classmates also were there. We were the only ones, and only had a towel on when we went into the room. A few minutes later, I was getting horny and accidentally dropped my towel. Everyone took theirs off and we locked the door to have sex. They we're naked, so I could see their bodies. I did everyone in every position and they gave me oral. This happened for two hours, until it was getting too hot in the sauna. We went to my room at that point, where we did it until morning came. For the rest of the trip, we kept doing this.