Innies and Outies: The Penis, Testes and More

An image of male anatomy Male_anatomy.png: alt.sex FAQ/Wikimedia CC BY-SA 3.0: https://creativecommons.org/licenses/by-sa/3.0/

A basic introduction to the anatomy of the penis and testes. Written using simple gender-neutral language, this guide is suitable for all ages.

http://www.scarleteen.com/article/bodies/innies_outies_the_penis_testes_and_more