Prevalence rates for several sexually transmitted diseases (STDs) have skyrocketed in recent years in the United States. According to the Centers for Disease Control and Prevention (CDC), three in particular have reached their highest point since tracking first began: chlamydia, gonorrhea and syphilis.

While the spread of STDs is often associated with vaginal or anal sex, these three STDs, as well as herpes, HPV and others, are likely seeing an uptick due to oral transmission. Before any sort of sexual encounter, evaluate the risks you're taking.

Chlamydia

In the U.S., chlamydia is the most commonly reported bacterial sexually transmitted infection (STI) across all age groups, with infections rising to a record 1.8 million cases in 2019. Chlamydia can be passed through oral transmission—either oral-to-genital or genital-to-oral contact—although vaginal and anal contact are more common sources.

Oral chlamydia could go unnoticed or