Oct 28, - Having sex before an ob-gyn visit can interfere with test results. Wexner Medical Center, says semen can even interfere with Pap test results. Dec 29, - You will be pushing harder than you've ever pushed before. Can you tell if I've had sex recently? it difficult to get an honest look at your vagina and cervix and are prone to causing “abnormal” results on your pap smear.