If you are talking about a Water Butt then yes !
It's called an Enema, and many people do it either for erotic or hygenic purposes.
Yes - depending on water pressure.
Yes always
It is not safe to put menthol in the anus.
It is safe to put yogurt in your anus.
The milk will not harm you, how you put it in may do so. There would be no benefit and silly to do it.
Put it in a safe.
That is a good question! If you put water slowly into the rectum through the anus, it will be absorbed. Large amount of fluids can be administered by this route in children and the elderly people. If you put rather large quantity at a time, it will stimulate the defecation reflex.
no
Rectum? Probably not; the rectum is inside the body, and you probably couldn't get to it. The anus? The anus is the ring of muscle that is the exit from the rectum. If he/she maintains some basic hygiene and cleanliness, and isn't ill with ebola or cholera or dysentery, it's probably safe to do. Kinky, perhaps, but safe.
It actually depends on what you stick in the anus. The wall of the bowel is relatively thin and could be perforated (torn) if you put something sharp or pointy in there. That said smooth objects, carefully inserted, should be safe enough.
No.
No. it is not.
I don't think it is because the anus has tons of germs!! Plus it probably won't be pleasant...
Because it is safe inside of the can and the can is hot, but just not the water