When I was little, I heard some kind of commercial that mentioned a "menstrual cycle". I got very excited, because I thought it was some kind of bicycle. Like, first you ride a tricycle, then training wheels, then a two wheeler, then a menstrual cycle. I soon learned the truth when I asked my dad for a "menstrual cycle" for my birthday at age 9.
A childhood belief about periods

others believed things like this
- I used to think that a menstrual cycle was a type of bicycle and i wanted to ride one.Anon
- I used to believe that a menstral cycle was a cycle in the washing maching. (my sister told me that)Anon
- that DOT was a particularly popular brand of motor cycle helmet.— Gary Watrous
- I used to believe that training wheels were the different colored beads on the spokes.— Samantha
- When my dad was little he thought that mistletoe was some kind of aircraft.— xoxo
- I thought Marco Polo was a kind of shirt.Anon