The enema was originally conceived as a sort of medical procedure, though one that was not entirely pleasant to undergo. Digestive discomfort and constipation were the primary problems that the procedure was designed to deal with, though there may be other conditions that require the use of one. Since then, thanks to the spreading availability of ways to administer an enema outside of a medical setting, they have been used in a number of ways that the original inventor likely did not intend. It is doubtful that the man responsible for the enema even conceived of some of the more intimate uses his creation might have, such as being a sexual health supplement.
The mechanics of an enema involve introducing a liquid into the rectum and colon via the anus. Originally conceived as a medical procedure, there can be any number of reasons why people would enjoy it being used as a sexual health supplement. The reasons can range from the male enjoying how it stimulates the prostate gland to virtually anyone somehow finding pleasure in the prospect of having an assortment of liquids pumped into their body through an orifice that traditionally goes the other way around. Still others...