The bottom line: No, you don't need to stress about using a dildo in your backside. Just be sure to take precautions—like using a toy designed for anal play and sterilizing it.
You can insert quite a long dildo but you must go slow. You have to get past another muscle group to get into the sigmoid colon, then if it's like about 18-20 inches (whew!) it has to go past another curve to get into the descending colon. This is possible if you go slow and use a LOT of lube, like J-lube for instance.
These large dildos - any above nine inches - can be used in anal and vaginal play, sex expert Sammi Cole explains. But there are some health risks to consider. But there are some health risks to ...
Most dildos can be used for solo anal penetration. As long as it has a base to prevent your bum from sucking it up and you’re comfortable with its size, you’re good to go.
Anal sex can also be performed with fingers or the tongue. Sex toys, like vibrators, dildos, and butt plugs, are used too. Like any sexual activity, anal sex isn’t inherently unsafe.
There are anal dildos that can be used for penetration much like a penis, sure, but your options don’t end there. There are also plugs, which are smaller and designed to be left in place.
Anal lube is an essential when you're having anal sex, pegging, fisting, or engaging in other forms of butt play. Here are the best lubes and creams.