Is TMI possible with kids?

So, I have a lovely 7-year-old son. I have always made a policy of being straightforward with him about people's bodies and such, so that when he asks where I pee from since I don't have a penis (I have used and he uses these words), and I told him I have a urethra that goes out of my body, same as him, it's just in a different place. So this is background.Yesterday we walked to a local store and I bought some tampons. He asked what they were for and I told him women get periods every month or so, which means blood comes out of your vagina uncontrollably, and the tampons help control/stop the flow so we can move around normally and not worry about it. He didn't seem shocked or wierded out at all and we talked about how that's where the baby comes out as well, and periods are a woman's body shedding an egg that doesn't become a baby. He, btw, is totally nonplussed in these discussions but inside I am asking myself what if this is too much? So basically, how do you guys feel about being straightforward, too straightforward maybe, about adult subjects? I don't want him to feel like a period is some freakish, terrible thing, but I also don't know that he needs to really know the details.Tl;dr: How do you talk to your young children about bodily (especially feminine) functions? via /r/Parenting http://ift.tt/2fk13cs