I used to believe that women could get pregnant from oral sex (as in a blowjob). A scoolfriend told me that some time in primary school. I actually believed that sperm could travel intact all the way through the woman's digestive system, then end up making a baby. I never thought of the idea people has sex not to make babies, but for fun...
A childhood belief about getting pregnant

others believed things like this
- I use to believe that the man peed in the woman to get her pregnant. Didn't know about sperm until sex ed. — das
- I believed that women who wanted babies ate a seed, which then grew into their baby. — World's Worst Scientist
- I used to believe that a baby's sex was determined by whether the sperm had a picture of a man or woman on it.— David E.
- I believed that oral sex was people having sex in space.
I think I got 'oral' mixed up with 'astral'— PinkPanther - when i was 5 years old I thought that a pregnant women deliever the baby by vomiting it — Nesreen Tashkandi
- When I was younger I thought that when a woman was pregnant she would feed her baby through her belly button!— Hennie