(I'm probably not supposed to share this so don't say anything, 'kay?)
Evidence your grade schooler has been exposed to way too much sexual information:
1 - "So where'd you get all that hair mom?" she asks in this really weird tone. I looked at her and knew exactly where her mind was but simply replied I had cleaned off the vacuum roller and through away the wad of string and hair into my bedroom trash. Then, because I'm never one to let a sleeping dog lie, I say "What did you think? I plucked out all the hair off my privates and threw it in the trash?" Her eyes got huge and she exclaimed "How'd you know that's what I was thinking?!?!"
2 - On the subject of weekend respite (two days with another licensed foster family so the foster mom can get some rest!) "You are going to respite. It's kind of like I get a date with myself." Her take on the subject? "What? Are you just going to turn into a lesbian and suck on your own boobs? (pause) Do you do that, Mom? Suck on your own boobs?"
Thus we have two rules in our family. My sex life is my own business as is what I do or don't do with my body. And I don't discuss either with my small daughter!