Tried one years back. It didn't do much for me except awaken a curiosity. I started to look for larger and longer items to insert. Until I caused a small tear. Ouch. The stinging during urination was unbearable for a few days. Luckily i had a very understanding doctor and I was playing solo at the time which ruled out a few causes, she put me on antibiotics as a precaution and told me I just had to suffer for a few days.
During those days I read some horror stories. Never again. Even my butt is exit only.