I personally went through training, and got certified to become a colon hydrotherapist. That is legal to do and to charge for. Giving enemas wouldn't be!
And there are only two states that require a license to be a colon hydrotherapist, Arizona and Florida. Basically if I remember, about an additional 8, maybe 16 hours of training to pass the test and get licensed.
And even in those states that don't require a license, we were all advised through the class, to obtain insurance!
Basically about the same as nurses would have, for the most part underwritten through one big company, and back then, not really expensive, at about $100.00 a year.
In Illinois, most professions are regulated by the Department of Professional Regulation... From doctors, nurses, lawyers, locksmiths, security installers and guards, even down to those that do 'fingernails'... All in all, about 100 professions, which you have to take a test for, be licensed and insured.
I'm surprised, but so far doing colonic irrigation's, or being a colon hydrotherapist, hasn't made it to that 'list' yet.
And basically 'anyone' can be trained to do these. Typically a clinic would send one person to the school for the training, then that person would come back and train others at the clinic. And that's legal!
Then being a 'male' offering such services to a female, you're asking for trouble! All it will take is being 'accused' of improper behavior, and you'll be spending 'thousands' in legal fees trying to defend yourself!
If you have an established business of doing colonics, have an established customerbase, 'and' are insured, you're much more protected!
How often have you heard about dentists being accused, and sued, for 'taking advantage' of a female patient while she is gassed?
And they have a lot more to loose!
No offence to women out there, but it's just all to easy for a female to 'just accuse' a man of rape, or some kind of abuse, for you to wind up in jail for a day or two, then trying to defend yourself, with an expensive attorney, in court.
If you want to pursue this, get trained a a 'colon hydrotherapist', then you can charge a fee for your services. But some advice... don't expect too many female clients! And if you open up such a business, you're obligated to take on male patients as well, or face discrimination issues!