My greatest first hand lesson concerning sex between a girl and a boy.
I was 12 at the time staying with my older cousin at her house for a weekend. My mom and dad were out of town. It was late and my cousin had put me to bed earlier. She was around 18 at the time. I woke up and wanted to get a drink of water so I headed downstairs to the kitchen. On my was I heard some sounds coming from the living room and I eased around the top of the stairs to see what it was. Was I ever in for a shock.
Sitting on the sofa was my cousin with her boyfriend. They were both stretched out side by side each other and he had his pants down around his ankles and his shirt open. She had her skirt up around her waist and her blouse open and no bra on. But, the big thing was her boyfriend. In my 12-year-old mind my cousin had her hand on his boy thing and it was long and big and hard looking! Her hand was going up and down on it. He had his hand up between her legs. The sounds I was hearing was what I later came to know as the sounds that men and women make when deep in the pleasures of having sex. I kept watching and it wasn't long when her boyfriend went to jerking his body and grunting and I saw the cum shoot from him all over his chest. Soon after, my cousin did much the same thing grinding her hips at his hand. I was witnessing a couple having orgasm but didn't know what I was seeing. I only knew it looked nasty.
Years later I put what I had seen and learned that night from my older cousin to good use.