When my siblings and were preteens our grandmother, a retired RN, taught us personal hygiene. Afterwards, enemas became our responsibility. A few months later, after school started in the fall, we started swapping enemas with one another on a fairly regular basis.
Fast forward a couple of years, when both my girlfriend and I were fourteen. Having asked my sister to give her enemas a few times for period cramps. My sister liked using a long-curved douche nozzle when giving enemas, because she liked moving the nozzle around, usually bring the recipient to orgasm. Having experienced an orgasm during one of my sister's enemas, my girlfriend started using a long-curved douche nozzle when she gave enemas. And like my sister, she’d slowly move the nozzle around when giving enemas, sometimes bring the receiver to orgasm.
After my girlfriend found out my sister and I were swapping enemas, she approached me about swapping enemas during her period. Because my sister told her, the douche nozzle worked just as good on boys as it did on girls. Something she was anxious to try on a boy. So, she asked me, because she didn't have a brother, only a younger sister.
Something that I can attest too, because it happened to me when both my sister and girlfriend gave me enemas using a long-curved douche nozzle. I can also attest too, it happening to both my sisters and girlfriend when I gave them enemas using a long-curved douche nozzle.