To deal with another aspect of your original posting, there are many sources of information on how to safely engage in enema play. Start by doing a Google search (enema -- "how to"). This was suggested to me by someone in the Forum who was getting tired of answering my questions about piercing and it really worked!

In another thread, BDSM_Tourguide wrote that enema play can strengthen your sphincter and he seemed to imply that it was a healthy practice (if I'm misinterpreting, I'm sorry). In fact, it is not.

In spite of the number of people who swear by the virtues of "cleansing colonic irrigations", they're just expensively fooling themselves. Enema play is not HARMFUL, if practiced carefully, but it's definitely not a 'good thing' from an intestinal standpoint. A phrase to keep in mind is, "all things in moderation". In this case that refers more to frequency of play than to quantity (which should be more or less self-regulating). The general rule is no more than one day per week. Playing more often than that can lead to 'lazy bowel syndrome', which more often occurs due to misuse of laxatives. The effect is to cancel most peristaltic movement through the lower bowel, which means you now NEED laxatives or an enema in order to "evacuate".

I hope this works out for you. Good luck.