The most common STIs passed with condomless oral sex are gonorrhea, syphilis, chlamydia and human papillomavirus (HPV).
Herpes can be passed from the mouth or genitals to a partner’s mouth or genitals.
The chances of getting HIV is considered low. If you had a throat infection, bleeding gums or sores in your mouth, your chances of getting HIV may increase.
Have a look at our ‘Oral sex’ and ‘My chances’ pages for more information.