genitalia
Are the Brains of Transgender People Different from Those of Cisgender People?
Are the Brains of Transgender People Different from Those of Cisgender People?
Shawna Williams | Mar 1, 2018
Research into the biological basis of gender identity is in its infancy, but clues are beginning to emerge.
Image of the Day: Beetle Penis 
Image of the Day: Beetle Penis 
The Scientist Staff | Dec 22, 2017
Scientists look to a leaf beetle’s genitals for lessons on improving catheter strength.  
First US Penis Transplant
First US Penis Transplant
Tanya Lewis | May 16, 2016
A man who lost his penis due to cancer has received the organ from a deceased donor.
Evolution of the Penis
Evolution of the Penis
Kerry Grens | Oct 30, 2015
A phallus-less reptile goes through a developmental stage with external genitalia, suggesting a common origin for the organ among amniotes.
A Case of Sexual Ambiguity, 1865
A Case of Sexual Ambiguity, 1865
Amanda B. Keener | Aug 1, 2015
This year marks the 150th anniversary of an autopsy report describing the first known case of a sexual development disorder.
A Tale of Two Genitals
A Tale of Two Genitals
Bob Grant | Nov 5, 2014
The genitalia of mammals and reptiles develop from two different tissues, but the structures share common genetic programs and molecular induction signals.
Spineless Sex
Spineless Sex
The Scientist Staff | Jul 1, 2014
Not to be outdone by vertebrates, invertebrates employ a suite of interesting structures and behaviors to accomplish procreation.