Male anatomy

http://www.teenwire.com/index.asp?taStrona=http://www.teenwire.com/warehous/articles/wh_19981201p050.asp

The Sex Project: male anatomy

http://www.sex-project.com/male-anatomy.shtml

The male reproductive system

http://health.allrefer.com/pictures-images/male-reproductive-anatomy.html

Anatomy of the penis and mechanics of intercourse

http://www.cirp.org/pages/anat/