According to the Centers for Disease Control and Prevention (CDC), Human Papillomavirus (HPV) is the most common sexually transmitted infection (STI) in the United States. Almost every sexually active person catches it at some point in their life. Chlamydia is the most common bacterial STI in the United States, with an estimated 1.4 million new cases diagnosed each year. Gonorrhea is the second most commonly reported STI in the United States. Other common STIs include syphilis, herpes, trichomoniasis, and HIV/AIDS. It is important to note that some STIs may not have noticeable symptoms, so regular testing is recommended to protect oneself and ones partner.