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Penile spines
Pointed structures on the penile glans and/or shaft / From Wikipedia, the free encyclopedia
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Not to be confused with Baculum.
Many mammalian species have developed keratinized penile spines along the glans and/or shaft, which 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 (strepsirrhines).[1] Penile spine morphology may be related to mating system.[2][3]
Penile spines of a domestic cat