Those fluids can enter the bloodstream of someone who doesn't have HIV during any type of sexual activity, including oral sex, through an opening such as a mouth sore or a genital ulcer.

Dry sex increases the risk of HIV transmission because friction can cause sores in the vaginal wall. If instead of having sexual intercourse a couple enjoy oral sex where one person licks or sucks ...

However, ejaculation in the mouth with oral ulcers, bleeding gums, or genital sores can increase the chances of HIV transmission. You can also get other sexually transmitted infections from oral sex.