Pretty similar to you. I don’t really remember specifically learning about it, it was just another topic I gradually learned things about. I vaguely remember having a book designed for children explaining the basic concepts and I probably asked my parents stuff and they answered. Then later we had sex ed in school several times.
Knowing my mom, she probably talked to me as a teenager and asked if there was something I wanted to ask. But I don’t really remember, so I guess it wasn’t especially awkward, just a normal conversation.
Sextidi. It’s what the sixth day was called in the French Revolutionary Calendar’s ten-day week. But to follow the example of the Roman calendar month-naming scheme, it will of course be the eighth day of the week. Also it contains the word “sex” which I expect will lead to both a lot of snickering teenagers and a lot of accidentally censored weekdays.