The answer depends on what type of sensitivity you're asking about. For example, the clitoris is considered the most sensitive part of the female body for sexual pleasure, with 8,000 nerve endings. In terms of pain sensitivity, the forehead and fingertips are the most sensitive areas.
However, different parts of the body can be more sensitive to different types of stimuli. For example, the lips are highly sensitive to touch and temperature due to the high concentration of nerve endings in this area.
It's important to note that sensitivity can vary greatly between individuals and can be influenced by factors such as age, gender, and health conditions.