Technically, it's the tips of the fingers; this is where the widest variety of nerve endings are most densely clustered.
However, in terms of sexual pleasure (which is more than likely how this question was intended) the parts in question are called the clitoris in women, and the frenulum (underside of the penis, near the head) in men.
Secondary sexual pleasure can be transmitted through the nipples of the breasts, the earlobes, the tongue, the sides of the throat, the base of the spine, the insides of the thighs and the backs of the knees. How sensitive and pleasurable these spots are varies from person to person.
Of course, the seat of arousal always resides in the brain; what one decides is pleasurable, is. This explains the existence of paraphilias (fetishes) such as being tickled or spanked.
Hair and nails are generally less sensitive to radiation compared to other parts of the body. However, it's important to note that all cells in the body can be affected by radiation exposure to some degree.
It all depends on the organs. Those cells, tissues and organs, where theres lots of division are most sensitive to the harmful effects of radiation at high levels of exposure, including the skin, the gut mucosa, hair follicles and so forth...
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!
The skin is the body's largest organ and typically the heaviest part of an average adult's body.
The three colors that our eyes are most sensitive to are red, green, and blue.
The most sensitive part of a dog's body is typically their nose.
the neck is the most sensitive part of your body - WRONG The correct answer is your lip then thumb
clitoris
The eyes.
The most sensitive part on a woman's baby when giving a massage would be her neck. When massaging a woman's neck it takes away her stress.
kidney is the most sensitive organ of the body.
The skin is the most outer layer of the part of our body.In that case it is the most sensitive part of the body so its the first part of the body that can respond to stimuli
because your tongue is the most sensitive part of your body
The Nipples are most sensitive.
Skin
The brain is not the most sensitive organ in the body. It actually only interprets what the sensory system information brings to it. You could poke a fork into the brain and it would feel no pain, flash a light on it, put a really smelly sustenance on it, put pressure on it, touch it, yell at it and it would not even notice that. So the sensory part of the nervous system is the most sensitive part of the human body.
Hm, I can think of two places. The perenium (spelling?!) which is the bit between his balls and his bum, tis very very sensitive. Also, the bit just underneath his penis where the tip meets the shaft. Go gently with both, some are more sensitive than others. WHAT IS THE MOST SENSITIVE PART OF A MAN'S BODY? WHERE IS HIS G SPOT. I HEARD HE HAD ONE.