I'm like you - I'm VERY open... I'm not sure if it's just because I think kids should know FACT from me vs. rumors from friends... Or because of what my son has been through... or because I taught sex ed to 6th graders a couple years ago....
Honestly - if you want to post what the question is/was I'd tell you exactly what I'd say as my answer - or you could PM me...
Last year my Fson (10) asked me about tampons and periods - even as far as where they go, why, how, ect. I answered every question he had. Did he think it was gross - yes, but he asked more questions
I guess it's partly because I think boys/men should know what happens to a woman's body.
My 10 year old understands PMS too