In the animal kingdom, penises can be spiked, split, corkscrewed – even detachable. They’re one of the most diverse structures in biology. The human penis is so uniform, it’s an anatomical outlier.
Monogamy : past and present / Ulrich H. Reichard -- Evolution of monogamy : mating relationships, parental care and sexual selection / Anders Pape Møller -- Mate guarding and the evolution of social ...
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