STD Risk and Oral Sex – CDC Fact Sheet. https://www.cdc.gov/std/healthcomm/stdfact-stdriskandoralsex.htm
4 Things You Didn’t Know About Oral Sex. https://www.webmd.com/sex-relationships/features/4-things-you-didnt-know-about-oral-sex#1
Is Oral Sex Really Safe Sex? https://www.verywellhealth.com/is-oral-sex-safe-sex-3133091
Oral sex. https://www.betterhealth.vic.gov.au/health/HealthyLiving/Oral-sex
Oral sex and STIs – what you need to know. https://www.health.qld.gov.au/news-alerts/news/oral-sex-STI-protection-condom-dental-dam