If you’re entirely new to anal penetration or have a medical condition that causes rectal pain, silicone is softer and more flexible than other materials.

Look for dilators made from body-safe materials, such as medical-grade silicone, that are free of phthalates and BPA. Not all materials are safe for your special place so you’ll definitely want to be mindful of what your device is made of. You should never insert anything into your anus that doesn’t have a flared base as it could become lodged and lead to a medical emergency. However, you’ll want to be sure anything you use has a flared base. Length isn’t a factor if your goal is dilation. Most dilator kits, like this one from VuVatech, start at around 0.5 inches in diameter, which is a good starting point for most. Resist the urge to start bigger because you’re liable to tear yourself a new one, for real. Otherwise, the general rule of thumb is to start with the smallest you can find and work your way up gradually.

If a healthcare provider has recommended you use dilators, chances are they’ve also provided some guidance as far as size. Here are some things to look for when shopping for dilators. Whether your dilator’s for medical purposes or for bottom fun, it’s going to be inside your body. We’re not saying you need to risk bankruptcy or anything, but choosing a quality dilator is important.