The likelihood of disease is lower when coitus is protected, while unclean sex may cause vaginitis, condyloma acuminatum and AIDS. 1. vaginitis: the disease is a common gynecological disease mainly characterized by increased vaginal discharge, usually associated with infection, dysbiosis, abnormal hormone levels and other factors, the clinical manifestations of vaginal itching, burning sensation, vaginal discharge abnormalities and so on. 2. warts: this refers to the body infected with human papillomavirus caused by wart-like lesions of sexually transmitted diseases, most often in the unclean sex habits of the crowd, clinical symptoms of foreign body sensation, itching, pain during sexual intercourse, private malodor, and so on. 3. AIDS: This condition refers to a systemic disease caused by infection with the human immunodeficiency virus, and sexual contact is one of the ways in which this virus is transmitted. Early symptoms include sore throat, night sweats, diarrhea, skin rash, etc. In the late stage, people die of serious infections or malignant tumors. Numerous diseases can be caused by unclean sex, which must be avoided. If there are symptoms of related diseases, it is recommended to consult a doctor for a clear diagnosis so that further targeted treatment can be provided.