Oral sex involves using the mouth to stimulate the genitals or genital area of a sex partner. There is little to no risk of getting or transmitting HIV from oral sex.Using a condom, dental dam, or other barrier methods the right way every time you have oral sex can reduce the risk of giving or getting an STD.Many sexually transmitted diseases (STDs) spread through oral sex.What Can You Do to Prevent STD Transmission During Oral Sex?.What May Increase the Chances of Giving or Getting an STD through Oral Sex?.Is Oral Sex Safer than Vaginal or Anal Sex?.