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image: Evolution of the Penis

Evolution of the Penis

By | October 30, 2015

A phallus-less reptile goes through a developmental stage with external genitalia, suggesting a common origin for the organ among amniotes.


image: Penis Transplant a Success

Penis Transplant a Success

By | March 16, 2015

Surgeons expect an organ donor’s penis given to a man who lost his in a botched circumcision to become fully functional.


image: Duck, Duck, Goose!

Duck, Duck, Goose!

By | July 1, 2014

Check out the remarkable explosive eversion of the duck penis.


image: Parsing the Penis Microbiome

Parsing the Penis Microbiome

By | May 29, 2014

Circumcision and sexual activity are but two factors that can influence the bacterial communities that inhabit male genitalia.


image: Why Many Birds Don’t Have Penises

Why Many Birds Don’t Have Penises

By | June 7, 2013

In avian species, a gene induces programmed cell death during development in the area where a phallus would otherwise grow.

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image: Circumcision Alters the Penis Microbiome

Circumcision Alters the Penis Microbiome

By | April 18, 2013

Diminished bacterial diversity and abundance may help explain why circumcision is associated with reduced HIV infection.


image: Penises: The Bigger the Better?

Penises: The Bigger the Better?

By | April 9, 2013

Female preference may have driven the evolution of human males’ relatively large genitalia.


image: Penis Size Matters for Golden Moles

Penis Size Matters for Golden Moles

By | February 21, 2013

Female golden moles are more likely to choose a mate with a longer reproductive organ.


image: The Detachable Penis

The Detachable Penis

By | February 14, 2013

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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