Chlamydia is the most commonly reported STD in the U.S. Its spread mostly by vaginal or anal sex, but you can get it through oral sex, too. Sometimes youll notice an odd discharge from your vagina or penis, or pain or burning when you pee. But only about 25% of women and 50% of men get symptoms.

What is the #1 most common way that STDs are spread?

Symptoms or disease due to the incurable viral infections can be reduced or modified through treatment. STIs are spread predominantly by sexual contact, including vaginal, anal and oral sex. Some STIs can also be spread through non-sexual means such as via blood or blood products.

Where do most STDs come from?

Sexually transmitted diseases (STDs) — or sexually transmitted infections (STIs) — are generally acquired by sexual contact. The organisms (bacteria, viruses or parasites) that cause sexually transmitted diseases may pass from person to person in blood, semen, or vaginal and other bodily fluids.