Can you really imagine humans evolving from dead bodies? Of course not, unless we are magical creatures who can be reborn from ashes or dust.

Reproduction is important to keep species alive. Plants, animals, microorganism and humans rely on reproduction to perpetuate their species. Without reproduction, humans would have been extinct millions of years ago. For this alone, we owe so much to our reproductive system.

The penis is the part of a male's body which varies the most from one person to another. Many boys worry that there is something wrong with them because they saw another boy's penis and it was a bit different to their own.

For the males, their penis is the most often used part of their genitalia. It is usually called the man