Right now I finished a text about modern anal sex toys and some medical devices from the first half of XX century. It's in Russian, my native language, but there are some links in English - for example, to description of Dr.Young's Ideal Dilators, an anal plugs that were used in USA from 1890-th up to 1940 (when was banned by FDA).
http://freeresearcher.net/2017/03/29/colon/ - my article (Russian, yet with many illustrations, including drawings from old US patents)
https://en.wikipedia.org/wiki/Dr._Young%27s_Ideal_Rectal_Dilators - Wikipedia article about dilators
Moreover, there was (and there are) some interesting connections between alternative medicine and kinky sexuality. Those 'dilators' are only one example. Here is a quote from Russian bestseller book (in 1990-th) 'Целительные силы' ('The Curing Powers'):
~~
Мочу для клизмы можно использовать как собственную, так и от здоровых людей, особенно однополых детей.
Однако, автор и эту процедуру улучшил так, что ее эффект МНОГОКРАТНО увеличился. Для этого необходимо собрать урину от любых людей (желательно домочадцев), чтобы получилось 2 литра. Налить ее в эмалированную посуду и без крышки кипятить до тех пор, пока не останется 500 граммов
~~(quotation ends)~~
In English:
~~
For enemas you can use your own urine or any urine from healthy people, especially from children of same sex. But even this procedure was modified by author and its become MUCH MORE effective. You need to collect 2 liters of urine from any people (preferably - from your housemates) and then to boil it without cover till you'll have only 500 ml of remaining liquid.
~~(quotation ends)~~
For me, it's too smelly, too risky and the idea of collecting children's urine is simply too weird to discuss. But that was a real bestseller, my grandma and most of her friends read that book. The same people, who worried about 'sex propaganda' in mass media.
There was also many pages in that book about enemas, including milk ones. Another kinky altmed example from Russia - also extremely popular 'Kuznetsov applicator' - a nailed pad for stimulation, you can see it and some related products here: http://malitskaya.livejournal.com/3697.html (the original one is on second photo).
Have anyone know any other examples of 'kinky alternative medicine'?