Under normal circumstances adult women have a pair of breasts, starting from the 2nd intercostal space and ending at the 6th intercostal space, medially at the sternal border and laterally up to the anterior axillary line (the vertical line downward from the anterior border of the junction of the upper arm and axilla), with the medial 2/3 located in front of the pectoralis major muscle and the lateral 1/3 on the surface of the serratus anterior muscle. The shape of the breast varies according to race, genetics, age, and breastfeeding. Breasts are nature’s masterpiece. Each breast contains about 15-20 lobes, each of which has a large milk duct that opens to the nipple, and in the middle of the lobes there are lobules, which are made up of many milk vesicles, and many small milk ducts that converge into a large milk duct to the nipple, which is a very clever design. During the growth period, these tissues will slowly expand and take shape. There is connective and fatty tissue between the lobes of the breast. The area around the nipple is darker and is called the areola, and there are raised granules in the areola area, which are sebaceous glands whose function is to keep the woman from becoming too dry while breastfeeding. This is the basic structure of the breast. The breast is a symbol of femininity and is the most slowly important part of the female sexual identity. The breast is also a sign of female sexual maturity, which not only nurtures the next generation, but also participates in human sexuality. The female breast is the touch point of the human body beauty examination, it resides in the primary position of sexual beauty. Full, proportionate, firm and moist breasts occupy a very prominent place in the beauty of the female form and will enhance the attractiveness of women. The most beautiful breasts should contain the following conditions: 1, full, proportionate, flexible and elastic; 2, the breast position is high, between the 2nd and 6th ribs, the nipple is located between the 4th ribs; 3, the interval between the two nipples should be greater than 20 cm, the radius of the base surface of the breast is 5-6 cm, the breast axis (from the base surface to the height of the nipple) is 5-6 cm; 4, the shape should be upright, hemispherical.