Don't do it!!!!!!!

I used to work for a company that sold colostomy products. 2 weeks of the grossest training I've ever had.
Anyways, from my understanding, the area of the skin around it can become irritated very easily.
With the digestive juices and then keeping the area clean it probably wouldn't be very comftorable.
I'm no doctor so I couldn't say what any onther health effects might be.
Also, I don't beleive the hole itself is ever really tight, and since it isn't a muscle like the anus it probably could get stretched out.
If you do try it, use lots of water based lube, go slow, don't use Force.
It would probably be a good idea to get some kind of medical advice too.

Hope that helps.