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A: A person can get an STD from performing oral sex on a female partner if she has an infection. STDs that can be transmitted this way include gonorrhea or chlamydia (which can rarely cause sore throat if they get in the mouth and throat), syphilis (which can cause ulcers on the lip or tongue), or viral infections such as genital herpes or HPV [wart viruses] (which cause blisters or warts on the lips or tongue). It is probably possible even to catch the AIDS virus (HIV) if an HIV-positive woman has a vaginal discharge or any bleeding and if the person performing oral sex on her has any mouth or lip bleeding. In many of these situations, the infection in the woman MAY not be obvious. "Safer sex" guidelines suggest using a "dental dam" (a square of thin latex rubber [like dentists use]) as a barrier between the mouth and the woman's genitals to decrease these infection risks.