1. can cause sores, rashes, dementia, or blindness HPV 2. can cause burning urination and infertility gonorrhea 3. similar to gonorrhea but more likely to be carried unknowingly syphilis 4. parasitic STD causing genital irritation and mild discharge chlamydia 5. pubic lice that cause itching crabs 6. untreatable STD causing periodic outbreaks of blisters genital herpes 7. can cause genital warts or cervical cancer trichomoniasis