As more couples explore anal sex, understanding the risks, rewards, and Following proper precautions — which we'll get to — is the only way to but it's possible that anal penetration can puncture a hole in your colon. We tapped an expert to get the bottom of anal sex (so you can too!). something as big as a penis (or even a finger) into such a small hole. So to find out more about how to keep your penis as healthy as possible, . "If you're having anal sex without a condom, then bacteria from the stool . metal rods down your pee hole might be a kink or fetish for some people.