The short answer, no.
Brief Anatomy Lesson
In order for a pregnancy to occur, sperm must make its way into the vagina, travel through the cervix into the uterus, and make contact with an egg in the Fallopian tubes. Because the digestive system (starting at your mouth and ending with your anus) and the reproductive system don’t meet in the body, there is no way for sperm to swim through one system to the other and make contact with an egg.
Having said that, although getting pregnant isn’t possible with oral sex, contracting a sexually transmitted disease like gonorrhea, chlamydia, syphilis, warts, herpes, or HIV is. To keep yourself safe from an unplanned pregnancy or STD, I suggest using a condom no matter what type of play you’re getting into, including oral, vaginal, or anal. If you choose to go the route of cunnilingus, I’d suggest using a dental dam to protect against STD’s.
If the taste of latex isn’t your thing, there are flavored condoms and dental dams made specifically for oral sex.
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