Sexually transmitted diseases (STDs) range from viral infections to bacterial infections. They're most often caused by sexual intercourse, including vaginal, oral, or anal sex. Common STDs include bacterial STDs (such as syphilis, chlamydia, and gonorrhea), viral STDs (including hepatitis, genital herpes, genital warts (HPV, and HIV), and parasitic STDs (such as trichomoniasis).
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