It is a normal physiological reaction to be kissed on the ear, because the ear is a more sensitive area of the body for many people. There are many sensitive areas of the body, including the ears, back, lower back and lower body area. The ear is one of the thinnest parts of the human skin, it does not have a hard skeleton nor after the fat package, so it is easy to be stimulated by the outside world, and the nerve network of the ear is very rich, connecting the nerve endings of the whole body, so when kissed or stroked, the tingling sensation will spread to the neck, with the spinal nerve spread to the whole body, producing a tingling sensation throughout the body.