Women's reproductive cycle and hormones were not fully understood until the 1920s when an Austrian researcher realised that adminstering natural hormones could be a way of preventing pregancy.
Sourcing the hormones was the problem however and, in order to produce a mere 50 milligrams of testosterone, a German biochemist was forced to process 25,000 litres of men’s urine taken from the Berlin police barracks.
Taken from Casanova's Condoms by Laura Essendine. Why not order now?
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