A childhood belief about reproduction

During the summer when school was out I would have to watch the Soaps with my nannie. Since we lived in the south and this was in the 1960's no one in our family openly discussed how a women became pregnant. But I remember the seeing the ladies on the television sitting on the sofas with their husbands/boyfriends. They would sit close, holding each other and kissing. As the scene would fade out the couple fell backward. Then came the commercials. Well next weeks episode the lady always told the man she was pregnant. So...I figured that as long as I did not sit on a sofa and kiss falling backward I would get pregnant. I kept that belief until I turned 15 years old!