Under normal circumstances, adult women have a pair of breasts, starting from the second intercostal space and ending at the sixth intercostal space, medially at the sternal margin and laterally up to the anterior axillary line (the vertical line downward from the front edge of the junction between the upper arm and the axilla), with the medial 2/3 located in front of the pectoralis major muscle and the lateral 1/3 located on the surface of the serratus anterior muscle. The shape of the breast varies according to race, genetics, age, breastfeeding and other factors. The breast is a masterpiece of nature. Each breast contains about 15-20 lobes, each of which has a large milk duct that opens to the nipple, and there are lobules in the middle of the lobes, which are made up of many milk vesicles, and many small milk ducts that converge into a large milk duct that leads to the nipple, which is a very clever design. These tissues slowly expand and take shape during the growth period. There is connective and fatty tissue between the lobes of the breast. The darker color near the nipple is called the areola, and there are raised granules in the areola area, which are sebaceous glands that function 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 important part of a woman’s 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. Female breast is the touch point of human body beauty, it is in the first position of sexual beauty. Full, proportionate, firm, moist breasts, in the female body beauty occupies a very prominent position, will enhance the attractiveness of women. Therefore, whether ancient or modern, in the body art modeling does not highlight the female breast. The most beautiful breasts should contain the following conditions: 1, full, proportionate, supple 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 basal surface of the breast is 5-6 cm, the breast axis (from the basal surface to the height of the nipple) is 5-6 cm; 4, the shape should be upright, hemispherical.