Growing up in the nineteen fifties, at the onset of puberty, our grandmother (a retired RN) taught us personal hygiene. I was twelve that summer, my brother eleven, and sister ten. Afterwards, once school started in the fall, we started giving each other enemas on regular basis after school, when we got home. Our sister giving me and my brother a couple of enemas, and we doing likewise for her. My brother and I, both had a thing about giving each other enemas. However, our sister on the other hand, didn't mind giving enemas to either boys or girls.
For example: One afternoon at my house, my girlfriend and I were doing homework together. I could tell, she wasn't feeling good, and said something about it. That's when she told me, "I need to talk to your sister." Got up from the table and went to find her. It turned out, she had started her period at school and was having cramps. So, she asks my sister, if she wouldn't mind giving her a couple of enemas, which my sister did. Later that evening, after we'd gone to bed, my sister told me what happened. About my girlfriend getting her period and asking for an enema. Once she'd given my girlfriend a couple of enemas, my girlfriend returned the favor, and giving her a couple of enemas. Then, she told me about their conversation, while giving one another enemas. My girlfriend told her, she and younger sister gave each other enemas on a regular basis after school, and my sister did likewise about us. She also, told my sister, that she wanted to give me enemas but was too embarrassed to ask.
The girl's conversation that afternoon, opened the door enough, that once she knew my sister and I were giving each other enemas. She was able to approach me about us giving one another enemas. A couple of months later, she did just that, starting something that lasted until we finished High School. Unlike my brother and I, neither girl had an issue giving boys or girls enemas. But my brother and I only liked giving girls enemas.