There is no clear relationship between being sexually active and developing breast disease. Risk factors for the development of breast cancer include family history, breast density, endogenous estrogen levels, hormone replacement therapy, obesity, and pregnancy, among others, which may lead to an increased likelihood of developing breast cancer. However, whether or not one is sexually active is not a risk factor for the development of breast cancer, but there is evidence that early pregnancy is a factor that reduces the risk of breast cancer. Some studies have pointed out that the risk of breast cancer in women whose age at first birth is <20 years old is half of that of women who have never given birth or whose age at first birth is later than 35 years old. It is recommended to maintain a good attitude towards life, establish an awareness of breast health care, learn about breast health care, learn breast self-examination, and attend regular screenings for early detection and treatment.