The penis is a gift of evolution. At least in the case of fish, in which most species have an external fecundation (like we see in most frogs and toads), and a penis would be useless. (the sole exception are sharks, rays, and species of Poeciliidae family and related groups, tiny tropical species, some very common in fish tanks...
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WOW, a gene for Oral Sex, what more can we ask for?
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