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Testes

Why Do Most Mammals' Testes Hang Outside of Their Bodies?

Quora | Posted 08.14.2015 | Science
Quora

There are many theories out there as to why sperm needs to be kept cooler and why the testes of most mammals hang outside their bodies, inside the scrotal sac. In my opinion, the least likely is the "handicap principle." The easiest way to illustrate this principle is the peacock's flashy feathers.

Caster Semenya: Tests Reveal Sprinter Has Both Male, Female Characteristics

New York Daily News | By Oren Yaniv | Posted 05.25.2011 | World

Tests show that controversial runner Caster Semenya is a woman ...and a man! The 18-year-old South African champ has no womb or ovaries and her testo...