The news is good. For a few reasons you should not be at all worried. Cunnilingus is one of the safest of all sexual practices:  few STIs ever are transmitted. Gonorrhea rarely if ever occurs by oral-vaginal contact (my forum colleague Dr. Hook was the senior investigator on one of the most important studies on this topic). Chlamydia rarely infects the throat no matter what kind of exposure. And oral infections with either one is always cleared by the immune system within a few weeks. Oral herpes due to HSV2 is possible but extremely rare; our forum colleague Terri Warren, who has run a herpes clinic for 50 years, has rarely (maybe never?) seen a patient who had oral herpes due to HSV2. Syphilis is possible but rare in women. There has never been a known case of HIV by such an exposure. Trichomonas and Mycoplasma genitalium do not infect the oral cavity at all -- and either of these also would be cleared by the immune system long before 18 months.

For those reasons, there is no realistic chance you caught any STI. and zero chance you caught something and still could transmit it to a partner. Neither you nor your partner needs testing for any STI.

I hope these comments are helpful. Let me know if anything isn't clear.

HHH, MD