Here is a list of interesting penis-related websites to complement what you've already learned here.

Penis Size

Mr. Average
This site attempts to honestly answer the one very important question: what is average?

Wikipedia Human Penis Size Article
I'm sure you know Wikipedia... well they have an article specifically about the penis size of the human species.

Penis Size Debate
A site to inform and help men who are confused about penis size, more specifically the significance of penis size to women.

General Penis Information

Erection Photos
This site contains research information on penile erections and, obviously, contains photos of erect and flaccid penises in a non-sexual context.

The-Penis.com
All sorts of information about the penis and male sexuality in general.

altPenis.com
Read and discuss enlargement methods, size issues, injuries, conditions, gender and penile health.

The Penis Size Links List
A big list of links to sites related to the penis.

Sexuality

My Male Sexuality
Comprehensive guides on various sexual matters.

Betty Dodson
The website of artist, author and sex educator Betty Dodson which covers a wide range of topics related to sexuality.

Masturbation

Healthy Strokes
A whole site about masturbation! You know... choking the bishop, wanking the worm, milking the lizard, straightening out the johnny...

Jackin World
...twisting the turnip, bashing the tent peg, beating the meat, jerkin the gherkin, walking the dog, squeezing the lotion dispenser, tickling the turkey...

Warning: most of these sites feature adult content. Use at your own peril.