Diminished bacterial diversity and abundance may help explain why circumcision is associated with reduced HIV infection.
The Scientist
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Female preference may have driven the evolution of human males’ relatively large genitalia.
Female golden moles are more likely to choose a mate with a longer reproductive organ.
A species of sea slug discards its penis after mating, then grows another the next day, a tactic that may have evolved to avoid passing on the sperm of competitors.
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