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The bones and hormones of deep water divers and pilots of high performance aircraft
  1. W H JAMES
  1. The Galton Laboratory, University College London
  2. Wolfson House, 4 Stephenson Way
  3. London NW1 2HE, UK

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    I have hypothesised that paternal hormone concentrations around the time of conception partially control the sex ratio (proportion male) of resulting offspring. Low concentrations of the testosterone/gonadotropin ratio are associated with subsequent daughters.1 Such low offspring sex ratios have been reported by operators of high performance aircraft2-4 and deep water divers.5 6 …

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