Quote Originally Posted by th3_kinkst3r
I dunno, but I read somewhere that petroleum-based stuff isn't too safe.

And, er, peristalsis kinda makes food go -towards- the rectum? I'm betting more on the injury-before-coming-out hypothesis

Are balls with paint on them safe to put in your mouth btw? Or should I wrap them with something first, like plastic bags?
Petroleum based lubes melt latex products. Petroleum based lubes also do not dry out. Put together, this means that orifices lubricated with Vaseline will render latex condoms worthless for an unknown period of time afterwards, or until they get a good scrubbing. Actually, that's a bit of a moot point, since I can't really imagine anyone volunteering for the later. Also, since they stay moist, said orifice will feel interesting for the next few days. Other than that, petroleum jelly is in some ways safer than water-based products, since it doesn't cause stomach upset, and is thick enough to stay in place under vigorous use.

I fairly certain that the reason that insertables get stuck is that they're hard and smooth. Feces is mallable, so you're always guranteed to be able to push it in whatever direction you squeeze. A plug isn't, so squeezing it will force it in whatever direction it's tapered in, up usually.