Defines sexually transmitted diseases (STDs) and labels their effects on the body. Contains definitions (including symptoms and outcomes if left untreated) of trichomoniasis, chlamydial infections, gonorrhea, urethritis and mucopurulent cervicitis, syphilis, HIV/AIDS, herpes, genital warts, pelvic inflammatory disease (PID), Reiter's syndrome, and mites and lice. Briefly discusses the effects of STDs on unborn children and infants. Lists tips on preventing STDs and seeking treatment.