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!
Science has proved that the nervous system is the least sensitive to radiation. Blood forming organs like marrow are the most sensitive.
Some guys are just more sensitive than others. And another factor is how turned on they are and also they cum faster when they have not had sex in a while
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...
the ear is most sensitive around 2-5 kHz as noted in http://www.silcom.com/~aludwig/EARS.htm
At frequencies in which the ears are the most sensitive.
The Nipples are most sensitive.
Guys have the same sensitive spots as girls do... The collar bone, behind the ear, the inner thigh, and the back of the knee but the most common is their neck
yes most guys who are that nice and sensitive are ticklish
The fovea
Their noses.
The sole.
twigs
the neck is the most sensitive part of your body - WRONG The correct answer is your lip then thumb
clitoris
hypothalmus
The underside
The flowers and the leaves