i'll give you three, unfortunately they all entail animal genitalia. i apologize- raccoons have bones in their penises. cats have barbs in their penises. ouch. snakes have two penises. the hemipenes. it's actually quite interesting: It is a saclike structure that must be turned inside out to be inserted in the cloaca of the female and can be removed only by turning it back to inside in, because to draw it out directly would damage the female considerably. The hemipenis is extremely variable in its overall appearance and structure; the cloaca of the female is often similarly constructed, thus preventing cross-fertilization by males of related species.
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raccoons have bones in their penises.
cats have barbs in their penises.
ouch.
snakes have two penises. the hemipenes. it's actually quite interesting:
It is a saclike structure that must be turned inside out to be inserted in the cloaca of the female and can be removed only by turning it back to inside in, because to draw it out directly would damage the female considerably. The hemipenis is extremely variable in its overall appearance and structure; the cloaca of the female is often similarly constructed, thus preventing cross-fertilization by males of related species.
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