Some have questioned the safety of drinking Chocolate Milk. They probably base this on the problem of going from anus to vagina. The bacteria in the anus are hostile to the bacteria in the vagina, leading to infections (which is why smart girls wipe from front to back).
The bacteria in the anus, however, comes from the stomach, so there is no problem putting it in another stomach.
It may even be healthy. Most animals eat each other's feces to cure bacterial imbalances in their own stomachs.