There was this woman in my church who told her granddaughter (I swear this true) that if she had sex she should jump up and down really hard. It would break the egg and she couldn't get pregnant.
Now here is another tidbit. The grandmother had 6 kids of her own. Guess that method didn't work too well!!!
A childhood belief about reproduction

others believed things like this
- i used to believe that if i didn't work at school, i would have donkey ears, so now i work hard !!!— denis
- I use to believe that the man peed in the woman to get her pregnant. Didn't know about sperm until sex ed. — das
- When I was little I used to think that as soon as you were married the woman automatically got pregnant.Anon
- Whwn I was like 8 I used to believe woman just got pregnant randomly. Anon
- i work with kids......and this one kid tole me that claustrophobia was the fear of Santa clause Anon
- I couldn't understand why my grandmother wore an ear-grenade (hearing aid). It sounded very dangerous to meAnon