From the outside, men have two visible sexual organs, the testicles (or testicles)and penis.
The testicles are the main sexual organs of men because they produce sperm and testosterone.
Sperm is the reproductive cell of men, producing more than 4 million new sperm per testicles per hour. source: Angier].
Testosterone is a hormone that causes secondary sex traits in men, such as facial and pubic hair, thickening of vocal cords, and muscular development.
The testicles are located outside the main part of the male body, in a capsule called the testicles.
This position is important because in order for sperm to develop normally, they must remain at a temperature that is about twice lower than normal body temperature.
It takes about 4 to 6 weeks for sperm to mature, and when they travel from each testicles to a spiral tube on the outer surface of each testicle, they do so, called vassal.
Sperm are often compared in appearance to a tadpole, which travels with a tail, while the head contains genetic material.
The penis is made of soft sponge tissue and can be expanded or contracted.
When a man is sexually excited, the penis is filled with blood, causing the sponge tissue to harden and the penis to erect.
This state of erection makes it easy to place the penis in the female vagina during sexual intercourse.
During sex, the male reproductive system is still working to provide the help needed for sperm fertilization.
Learn more about the process on the next page.