Anal sex is when one person places an erect penis, finger, or object into the anus of another person to give and receive sexual pleasure. Many people enjoy anal stimulation. Some people, though, don't like anal sex.

Unlike the vagina, the anus doesn't have its own lubrication. The anus also has a very strong muscle that is designed to keep things out of the rectum. That's why it’s important to be relaxed and use lubrication (which you can pick up at a pharmacy or clinic) on anything going into the anus to avoid tearing or irritating the lining of the anus.

When inserting something into the anus, go slowly and stop if there's pain or resistance. It's best if a person empties the bowels (goes to the bathroom) before anal intercourse and washes well before and after anal sex or oral-anal contact.

Bacteria in fecal matter (poop) can spread to other body areas if someone touches your anus and then other parts of your body. (For example, during sex between a guy and a girl, it’s important to be careful not touch a girl's anus, then her vagina, since this can lead to an infection.) It is important to use a condom, latex glove or dental dam when having anal sex. It is also important to wash thoroughly.

Like other forms of sex, it is possible to transmit sexually transmitted diseases (STDs) between partners during anal sex. Ejaculating into or onto the anus, having oral-anal contact, or inserting something into the anus, then inserting the same object into a partner's anus, vagina, or mouth can all transmit infections.

There are lots of ways to reduce the risk of getting or giving an STD from anal sex. For example, you can use a condom on the penis or your finger. You can also use a female condom inside the anus. You can put a latex or non-latex glove on your hand. For oral-anal contact, you can use a dental dam over the anal area.