Your urine tests done at 4 weeks should have been accurate for gonorrhea, because most results are accurate after 7 days. Knowing you have the extra protection a condom provides can help make you feel more liberated and less inhibited during oral sex. Remember that oral sex should be fun for both of you. These could be a sign of an infection, so get them checked out by a healthcare professional. The main risks arise if the person receiving oral sex has an STI or sores on their genital area, or if the person giving oral sex has sores in their mouth or bleeding gums. The blood test for syphilis, done at 4 weeks, may be a bit early. The most sensitive part of the vagina for a woman is the clitoris, which has more than 8, nerve endings. Talking to your partner about protection before you start having oral sex will help things go more smoothly. You might find it helpful to look at our " STI at a Glance " chart. Do not let it sit in your mouth for long periods of time, as it might make its way through open sores or damaged tissue in the mouth. Using a condom or dental dam a thin, soft plastic that covers the vagina or anus will protect you from most sexually transmitted infections. Gently part the outer lips of the vagina and look for the vaginal opening, and the hooded clitoris just above it. Among the routes of transmission, the one with the highest prevalence is the sexual route; either through anal sex, or vaginal. When giving oral sex, always spit or swallow ejaculate. Take your time to explore her upper thighs and the area around her vagina first, to help her get aroused. Once semen makes its way past the mouth, stomach acid and enzymes in the esophagus kill any HIV in it, so swallowing is actually one of the safest things to do after a blow job.