Diseases such as Chlamydia , human papillomavirus ( HPV ) , gonorrhea , herpes , hepatitis ( multiple strains ) , and other sexually transmitted diseases ( STDs ) , as well as viruses such as HIV , can be transmitted through oral sex . Chlamydia , human papillomavirus ( HPV ) , gonorrhea , herpes , hepatitis ( multiple strains ) , and other sexually transmitted diseases ( STDs ) , can be transmitted through oral sex .