You would think that putting a purpose made object into your anus would be easy enough, However it seems like every where in the BDSM world health and safety all ways turns up. I was researching but plugs today (as you do) when I came across these articles. I thought it was worth share a part of them.
Once, I opened my lingerie drawer to notice that a rubber vibrator had leaked pink dye everywhere. If unsafe toys can stain my underwear, what else can they harm? As xxxx points out, "Cheaper toys might be made of chemicals that can leach into your body."
According to the xxxxx anything that's silicone, borosilicate glass (Pyrex), or stainless steel is a good bet. xxxxx suggests beginners select silicone over glass or steel, as silicone has more give and is easier to insert. All three materials are nonporous and so can be thoroughly cleaned after use. Butt plugs made of hard plastics and acrylics, on the other hand, are porous, meaning they can become hotbeds of bacteria from your GI tract, which is neither safe nor sexy.
But not all butt plugs are created equal. Even though I initially liked the plugs I purchased, I quickly learned that they were made from PVC and had a jelly-rubber core, two materials that often contain phthalates, which are chemicals used to soften plastic so it's flexible. Although phthalates are found in everything from shower curtains to plastic wrap, exposure to them has been linked to hormone disruption, so many experts don't consider sex toys that contain them body-safe. In fact, after only a few months, my first butt plugs melted into a disgusting tar-like puddle after sitting unattended for a week or so during a warm season.
So there you are. I think that silicon plugs can be bought quite cheaply.