Eddie can very clearly remember when he first thought of his mother as an object of his desire. Oddly, it wasn't even his idea: it was his father's. Eddie normally didn't get along very well with his father, who often seemed cold and distant. But he was secretly very grateful for everything his father taught him that day.
Eddie's father had taken him out for a father-son camping trip. The camping trip wasn't his father's idea, but was Eddie's. It was Eddie's mother, Patricia, who cajoled her husband into taking their son out for the trip. It was to be a short overnight stay in the mountains. Once they got to the camp site and set up, Eddie's father had started into the liquor, and shortly became fairly drunk. Eddie had heard that drunk people told no lies, so he started testing the situation by asking his father questions about Eddie's favorite topic: women.
It didn't take long for Eddie's father to become visibly frustrated, and start into a long, rambling, drunken lecture about what women want. At least it started out that way, but Eddie quickly realized that it was actually about his mother.