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An old wives' tale is a wisdom much like an urban legend, supposedly passed down by old wives to a younger generation. Today old wives' tales are also common among children's peer sex education in school playgrounds. Old wives' tales often concern pregnancy, puberty and nutrition.
Some old wives' tales are true, and those that aren't often have roots in truth or are used to trick people into doing something.
Half-truth
Carrots do contain vitamin A, which helps to maintain healthy vision, but they do not contain enough to make any significant difference. This tale started in the second world war when the British spread a rumour that their pilots were eating carrots to give them improved vision, concealing the truth about the invention of radar.
False
This is an example of an old wives' tale in peer sex education. It may seem somewhat logical to a virgin but is not true. Sperm are capable of swimming up the vagina, through the uterus to the fallopian tubes, where they may fertilise an egg, regardless of how a woman is positioned during or after sexual intercourse.
False
Chocolate does not cause acne, in fact there is little evidence that one's diet affects acne at all. This is an example of an old wives' tale used to discourage something (the large quantities of chocolate some children eat is unhealthy in other ways) by associating it with something that people are afraid of.
False
Again, this is an attempt to discourage masturbation (usually among young males) by associating it with blindness. Masturbation in females is sometimes said to cause infertility; this is equally false.