Yes, whether it’s through Anus, vagina or mouth. You can get STD anyway. There’s actually a research that STD is transferred through any form of body contact. Chlamydia, gonorrhea, and syphilis can be transmitted to the rectum if you have anal sex with an infected partner, Karen Brodman, MD, a gynecologist in New York City, tells Health. Your risk of one of these backdoor STIs increases if you develop small tears or nicks in the thin skin of the anus, through which the bacteria can get into your system.