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Sex determination

Explore ancient and early 20th-century ideas on sex determination. From lying on the right side to tracking ovulation, discover the intriguing notions that influenced gender prediction. Uncover the evolution of beliefs regarding conceiving boys or girls.

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Sex determination

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  1. Sex determination Boy or girl?

  2. What people used to think • “If a woman lies on her right side during intercourse, a boy will be conceived.” Parmenides, 5th century BC • “If a man and his wife wish to conceive a son, the man must tie his right testicle with string.” Hippocrates, 460-360 BC

  3. What people used to think • “The woman is responsible for the sex of her child. All eggs released from the right ovary will develop into boys. As eggs are released from the left and right ovaries on alternate months, a woman who keeps track of her menstrual cycle after her first child has been born should be able to produce a child of the desired sex.” Dr E Dawson, early 1900s

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