As I arrived home from school that day, I knew something was going on. I could hear the moans and groans and could almost detect the odor of sex wafting through the house. It was not unusual for my mother and step-father, Don, to make love during the day and I had actually grown accustomed to it. They had been married three years and loved sex. I could hear them at night in their room as they made mad, passionate love tog...