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sex

Conditions of affection

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A cock embryo's male genitalia (artificially dyed red) before it withers, as seen under a scanning electron microscope. Figure (AM Herrera and MJ Cohn, University of Florida)

Why did the birds lose their male genitalia?

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Sea snails have mutual sex (each is both male and female). Photo: Ayami Sakizawa, Osaka University

Nudibranch: A species of androgynous sea snail sheds its penis after each mating but also regrows it

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C. elegans worms in a petri dish - those that reproduced sexually survived better

The advantage is that it reproduces sexually

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