Oil-based lubricants like Vaseline, oils, or creams can damage condoms and other latex barriers. Be sure to use water-based lubricants. Oral sex has some risk of transmitting HIV, especially if sexual fluids get in the mouth and if there are bleeding gums or sores in the mouth. Pieces of latex or plastic wrap over the vagina, or condoms over the penis, can be used as barriers during oral sex. Condoms without lubricants are best for oral sex.
Most lubricants taste awful.
Some people who are HIV-infected don't see the need to follow safer sex guidelines when they are sexual with other infected people. If you don't, you could be exposed to infections such as herpes or syphilis. If you already have HIV, these diseases can be more serious. These reasons for safer sex are very controversial. Although some researchers and doctors think these risks are real, there is no scientific proof.