That's not always the case... Some remain the same colour as the rest of the skin. It depends on the individual guy.
Physically, it's usually the genitals -- primarily the testicles. These are the parts that hurt like heck if you kick a guy in the crotch. During sex though, it's the erect penis. Different parts of the penis are sensitive on different guys. For some of us, it's the underside, for others it's the tip. For some guys it's the very base of the penis, right where it joins the rest of the body. (There are exceptions, of course -- everybody's different.) Emotionally, a guy's most sensitive part is just like a girl's -- it's the heart. We're just more likely to hide the pain!
They have it so when in a sexual intercourse (sex) they can sperm the girls egg!
Electrical energy is used to transmit messages from one part of the body to another through the nervous system. Nerve cells called neurons use electrical signals to communicate with each other and relay information throughout the body.
The lungs are a part of the pneumatic system in the body. They are responsible for exchanging oxygen and carbon dioxide during breathing.
The skin is the body's largest organ and typically the heaviest part of an average adult's body.
The size of your penis has no relation to the size of any other part of your body, including your forearm.
No. There is no relationship between the size of your penis and any other part of your body. In the past people have suggested relationships between the sizes of feet, hands or the length of noses being linked to penis size but there is no evidence for any link to any other part of the body.
The penis can become dry just like any other part of the body like your face or hands. Dry skin is more common in the winter months when there is less humidity in the air. The penis can be moisturized with any type of lotion or moisturizer just as any other part of the body.
PENIS!
penis and vagina
your penis and boobies
No. Nothing has ever been invented or developed yet that will increase the size of the penis or any other part of the body aside from muscles.
The male body part is spelled as it is in the question: penis. The penis is part of the reproductive system and the urinary system.
Any part of the human body can have freckles.
The penis is primarily part of the Reproductive System but is also part of the Urinary System because the penis has two primary functions.
penis and vagina
Urine exits through the male's penis.