I was told by a friend that after a woman had a boy she couldn't have any more kids, and since her youngest sibling was a boy and I only had a younger brother, I believed it.
A childhood belief about reproduction

others believed things like this
- i used to think that if you were a boy your younger sibling would have to be a sister and vice verca (sp?)— ben
- That you had to marry your sibling. During this period of time I devoliped a crush on my brother.— don't worry I'm a girl
- My younger sibling thought that Brittany was the name of the country where British people livedAnon
- When I was younger, I think i can change my brother with a friend— Mbaclé du 55
- When I was younger, I believed that times tables in maths were kids sitting at tables staring at clocks!Anon
- When I was around 13, my younger brother told me that oral sex was when 2 people talked about sex.Anon