Cotton is better than other chemical fibers. For the shape and style of underwear, it is best to choose briefs or boxers that can wrap the buttocks. Body-shaping underwear is not conducive to blood circulation because it is too tight, and it is generally made of chemical fiber fabric, which is also not conducive to ventilation (for girls, airtight is easy to breed bacteria and lead to various inflammations. . ) and may emit some harmful chemical gases, which should not be worn for a long time. T-underwear is very sexy, but wearing it for a long time may lead to hip drooping and hemorrhoid growth. Reference answer: cotton is better 1. Underwear that should not be worn too tightly. Women's vaginal opening, urethral opening and anus are very close. Wearing underwear too tightly can easily cause frequent friction with vulva, anus and urethral orifice, so that germs in the dirt (mostly anal and vaginal secretions) in this area can enter vagina or urethra, causing urinary system or reproductive system infection. Clinical common diseases such as urethritis, hematuria, vaginitis, hemorrhoids, early stage of intestinal cancer, etc. At the beginning, there was only a small amount of secretion. Female patients are often confused with menstruation due to their physiological characteristics, thus losing their vigilance. From this point of view, underwear can help people find the clues of the disease as soon as possible ... 2. It is not advisable to wear dark underwear, because women with vaginitis and reproductive system tumors will have turbid leucorrhea, even reddish and yellow, which are all signs of the disease. If we can find these phenomena early and treat them early, we can get better curative effect. If you wear dark underwear or underwear with too many patterns, the sick leucorrhea will not be found in time, which may delay the illness. 3. Underwear that is not suitable for wearing chemical fiber is cheap, but its permeability and hygroscopicity are poor, which is not conducive to the tissue metabolism of perineum. In addition, the secretion of leucorrhea and perineal gland is not volatile, which makes the vulva wet all day. This warm and humid environment is very conducive to the growth and reproduction of bacteria, and it is easy to cause inflammation of vulva or vagina.