It is funny, but I just posted a story regarding my step mother in another thread, regarding see through bikinis. Around the same time as the other post, late 70's, my father and his girlfriend, another couple who were good friends with my step mother, and their kids went on a week long trip to Yellowstone. We slept in tents, and I found it kind of strange that the adults shared a tent, and the kids shared the other. This was weird for me since I had been camping and backpacking numerous times with my father and had always slept in the same tent, but this time, my sister and I were forced to sleep in a tent with two other strange kids who we had never met before. I never slept that well on the ground in a sleeping bag, and would toss and turn waking briefly numerous times during the night. The first evening all of us kids went to bed as the adults stayed around the fire drinking and talking. We had driven quite a few hours and I was actually pretty tired and drifted off into a coma fairly quickly as did the others in the kids tent. During my tossing and turning, I woke up early in the morning and heard what I thought was crying coming from the adults tent a few feet away from our tent. It was the first time that I really realized what was going on, and I could hear the rythmic noise of the sleeping bag in the adults tent sliding against the interior wall of their tent as my dads girlfriend would brush against it with each thrust. As the thrusting got more rapid she was really started panting and moaning. I actually heard her gasping that she was cumming, although I didnt really know what that meant at the time. It would not be the first time that I heard the adults tent making sex sounds on that trip. All I know is that because I had heard my dads girlfriend in such a vulnerable way, I neverlooked at her the same way again, and was terribly attracted to her after that experience.