Without condom is like a Russian roulette. It's a lethal game of chance in which a player places a single round in a revolver, spins the cylinder, places the muzzle against their head, and pulls the trigger. Everyone loves bareback, but...
Although STI transmission is possible through oral sex, it happens rarely. Perhaps with this information, you could change your signed name from "worried" to "wary" or "wise"? When the mouth and tongue are healthy and uncut, the chance of getting a sexually transmitted infection (STI) through oral sex is uncommon, though possible. Sores or scrapes in the mouth present a ready passage-way for virus or bacteria to enter the ******* stream. Unless you're 100 percent sure of your partner's clean bill of sexual health, it's a good idea to use protection if any cuts, tears, sores or scrapes are present in the mouth (even tiny sores, like accidentally biting your tounge). Additionally, after you've had your wisdom teeth yanked, a root canal performed, or your dentures re-fitted, it's wise to stay away from unprotected oral sex (even if your partner is STI-free).
STIs, such as gonorrhea, syphilis,chlamydia, and HIV, can be transmitted through contact with bodily fluids, including pre-ejaculatory fluid or ejaculate. Herpes and human papillomavirus (HPV) can also be passed on through oral sex. Although these cases are rare, transmission is possible, and if you don't want to gamble with your health you could try using an un-lubricated condom