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.
Science has proved that the nervous system is the least sensitive to radiation. Blood forming organs like marrow are the most sensitive.
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!
arm
if your health your brain
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.
Most probably her eyes because eyes are the most sensitive organ of the human 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
Science has proved that the nervous system is the least sensitive to radiation. Blood forming organs like marrow are the most sensitive.
this is the most sensitive part of the body when the body is stimulated. the gee sport can arouse sexual feelings.
The Nipples are most sensitive.
Skin