A little talk about sex ed didn’t hurt anyone.
It is possible to contract STIs (sexually transmitted infections) through oral sex, but the risk is much lower than vaginal and anal sex.
Use barrier methods and take precautions to practice safe sex:
Communicate with your partner.
Talk to your partner about each other's sexual health history and STI status before engaging in oral sex.
Know the potential risks.
STIs you can transmit through oral sex include Human papillomavirus (HPV), which causes genital warts; Hepatitis A, B, and C; oral herpes and genital herpes, gonorrhea, Chlamydia, Syphilis, and HIV. STIs can be asymptomatic, but possible symptoms include a sore throat and sores in or around the mouth or throat.
Use protection.
For maximum STI prevention, use a condom if you are giving head and a dental dam during cunnilingus and rim jobs.
Take precaution.
The risk of STI transmission is typically higher for those giving oral sex than those receiving it. To decrease the risk while giving oral sex, avoid brushing your teeth or using dental floss right beforehand, since bleeding gums will increase exposure to any viruses.