A Curious History of Sex

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C. D. Hunt and others, ‘Effects of Dietary Zinc Depletion on Seminal Volume and Zinc Loss, Serum Testosterone Concentrations, and Sperm Morphology in Young Men’, The American Journal of Clinical Nutrition, 56.1 (1992), 148–57 https://doi.org/10.1093/ajcn/56.1.148; Radhika Purushottam Kothari, ‘Zinc Levels in Seminal Fluid in Infertile Males and Its Relation with Serum Free Testosterone’, Journal of Clinical and Diagnostic Research, 10 (2016), CC05-8 https://doi.org/10.7860/jcdr/2016/14393.7723.