I can't speak for the girls, but I can speak for myself. When I was boy, enemas were a turn on for me. They would make my penis get rock hard before I was eight years old, as best I recall. I didn't understand what it was all about at that age. However, I loved the way enemas made me feel when my mom or grandmother gave me one. From eight to age twelve, I would sneak enemas when every I could, because the enema bag was always hanging in the shower. When I turned twelve, my grandmother taught me to self administer. As I went into my teens, I couldn't get enough enemas. I masturbated with each enema I took, and they made my orgasm far better with, than without, the enema.
Just after I got married, I learned that girls get just as turned on as boys do, when it comes to enemas. I had talked my wife into trying an enema for something other than constipation, and as I gave her the enema, she masturbated, and afterwords, she told me, "that enema made my orgasm stronger, an last twice as long. I never knew enemas would do that". I ask her, when was the last time you had an enema? She told me, "I don't remember, maybe eleven or twelve". After that night, enemas became a part of our sex life.