My friend used to think that having a threesome would mean you would have twins.
A childhood belief about sex

others believed things like this
- i always thought twins had the same name as each other— Elle
- i believed if you had sex twice in a row you would have twins— dona
- I used to believe that twins were always identical.Anon
- i used to believe i would 'catch up' to my big brother one day and we'd be twins.— lil' sis
- That you could give birth to what ever you chose (i.e a girl, a boy, twins, triplets)— Krista Durling
- My friend's mom told my friend's little sister thatI when a dog died, it went to a retirement home.— ellen