What's the average size of the penis? What are the extremes?

According to specialists, the average is 15cm and 90% are between 13 and 18cm.

The records for a fully functional penis are 1.5cm and 30cm.

Can penis size be increased?

Yes. There are two surgical procedures to increase penis size-- the Bihari Procedure, and Fat Injection.

The Bihari Procedure consists of cutting the ligament that secures the base of the penis to the body. This gives between one-half and two inches of increased length to the penis; however, because the penis is no longer anchored to the body an erection no longer points 'up.'

Fat Injection is the process of removing fat from the backs of the thighs and injecting it into the body of the penis to make the penis thicker. Because the body rejects a significant portion of the injection this procedure may need to be repeated several times and each operation carries with it a severe risk of infection.

What is circumcision and why is it done?

Male circumcision is the surgical removal of the foreskin from the penis. When performed in a hospital, it is usually done shortly after birth by a doctor or midwife. Circumcisions are also given to Jewish boys by a mohel in a ceremony eight days after birth.

Some Islamic boys are circumcised when they are older, around age 12. The majority of American boys are circumcised.

Common reasons for circumcision include: better hygiene, "normal" or "better" appearance, and "his penis should look like his father's."

Common reasons against circumcision include: it is no longer necessary for hygienic reasons; it is a painful, barbaric practice; possibility of infection or surgical error; "normal" or "better" appearance; "his penis should look like his father's."; and "greater sensitivity of uncircumcised penis."

Hope this clears some mysteries for you.