A childhood belief about reproduction

When I was 4 and my mom was pregnant with my little sister, she told me all about the egg and the sperm except for how the sperm got from the man's body to the woman's. First, I thought that it came out his foot and then wriggled its way across the floor until it came to a woman and then climbed up her leg to her uterus. I decided that couldn't work. Then I thought that it must go through his spit when he kissed her. I thought that if the people weren't married yet, then the sperm couldn't be able to get through. So people who weren't married could kiss and not make a baby, but people who were married were really making a baby when they kissed.