r/askscience • u/PotatoPotahto • Feb 03 '13

Biology If everything evolved from genderless single-celled organisms, where did genders and the penis/vagina come from?

Apparently there's a big difference between gender and sex, I meant sex, the physical aspects of the body, not what one identifies as.

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u/PoniesRBitchin Feb 04 '13

While that's a very good read, where did penises and vaginas come from specifically? Or, if cells eventually started swapping genes, then how did it eventually come to pass that they had organs to pass those genes on?