My little brother, who just turned 13 by the way, thinks that orgasms end in "peeing" and that you "pee" inside a woman during sex. Also, once, when he was younger and he was laying on me after taking a shower, I was tickling him and his privates got close to mine (I was fully clothed). I somehow managed to convince him that the baby I was having was his! Boy, was he worried when he heard me tell mom that I was pregnant!
A childhood belief about reproduction

others believed things like this
- Until about the age of 13 i used to think that oral sex was 'normal sex' but fully clothed!!— Daveyd
- When I was younger I thought that when a woman was pregnant she would feed her baby through her belly button!— Hennie
- When I was first told about intercourse, I didn't believe it. How could peeing inside a girl make a baby?— Art
- A friend of mine used to think that you got pregnant from eating baby food.— Jemima
- When I was younger I thought I made up a new way to tickle someone--by tickling their stomach.— Amelia
- My friend managed to convince a gulliable kid at various stages of school that he was superman and a robot.— naff