SEXUALLY TRANSMITTED INFECTIONS Overview  In the 70s, there were only 2 commonly known sexually transmitted diseases/infections (STIs). There are currently at least 30 STIs.  The ten most common STIs are chlamydia, gonorrhea, syphilis, HIV/Aids, hepatitis B, genital herpes, HPV, trichomoniasis, crabs, and mycoplasma genitalium.  What causes STIs? STIs can be caused by bacteria (e.g., chlamydia, … Continue reading Sexually Transmitted Infections