Thinking back to living in a large apt building in the 1950's - seems a lot of the women my mother knew in the building were into enemas, based upon conversations I overheard. Nothing sexual about their enemas (at least openly) - it seems they all had a thing for using enemas to stay regular and would share information about enemas they used..
Now-a-days, seems like men are way more into enemas than women (thanks in part to those women of yesterday giving us enemas!).
Perhaps it's more natural for men to find enemas more exciting than women do, whereas for women it something that has to be passed down from mother to daughter, akin to way wearing a girdle with stockings once was...
I don't really know, and just mentioning this to see what others think.