Penile spines
From The Art and Popular Culture Encyclopedia
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Throughout many mammal species, males have developed keratinized penile spines along the glans and/or shaft of their penis that may be involved in sexual selection. These spines have been described as being simple, single-pointed structures (macaques) or complex with two or three points per spine (prosimians). Penile spine morphology may be related to mating strategy.
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