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"The bizarre sex life of the spiny anteater has been exposed by researchers – the male ejaculates using only one half of its penis. New findings about the creature’s sex life may seem salacious but they could help shed light on an evolutionary mystery.
It seems that the way the mammal ejaculates is similar to the way reptiles do – by shutting down one side of its penis before secreting semen from the other side. Reptiles have a pair of male members called hemipenes for sex, and they use only one of the two during each act of copulation."
Exhibitionist spiny anteater reveals bizarre penis - life - 26 October 2007 - New Scientist
It seems that the way the mammal ejaculates is similar to the way reptiles do – by shutting down one side of its penis before secreting semen from the other side. Reptiles have a pair of male members called hemipenes for sex, and they use only one of the two during each act of copulation."
Exhibitionist spiny anteater reveals bizarre penis - life - 26 October 2007 - New Scientist