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!
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Physiologically, the penis is typically considered the most sensitive part on a man's body, as it contains a high density of nerve endings. However, emotional sensitivity and vulnerability can vary among individuals, and it's important to consider mental and emotional well-being in addition to physical sensations.
The three colors that our eyes are most sensitive to are red, green, and blue.
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...
The human ear is most sensitive to frequencies between 2,000 and 5,000 Hz. This range corresponds to the frequencies commonly found in human speech, which may explain why our ears are most attuned to sounds within this range.
Cells that are actively dividing, such as those in the bone marrow and gastrointestinal tract, are most sensitive to radiation damage because they are constantly replicating and thus more susceptible to the effects of radiation.