The reason for this is that the nipples may be normal for women, but most men may be a disease factor, the possible causes are: 1, the female orgasm during sex is the nipples will be erect and swollen, but also may be distended and painful, is a normal performance. 2, menstrual syndrome caused by the nipple enlargement, pre-menstrual and menstrual period performance is more obvious, consider the endocrine reasons, can be treated, but also ignored. 3, congenital nipples large, and genetic and physical related, does not affect the life, does not affect the aesthetics of the person can be surgical plastic surgery. The company’s main business is to provide a wide range of products and services to its customers.