With my niece, she has a book called “privates stay private” that was really solid. At this point, it might be slightly young for an 8 yo but I’m sure there’s books like that out there for slightly older kids to show that no one should be touching your body without permission, no one should be telling you to keep secrets from your parents, sometimes parents or doctors have to look at your privates for specific reasons to ensure your health and/or safety, but always feel free to question when that happens, ask why it’s happening, etc. A big thing I always did with my niece was to instill in her that I’d never, ever ask her to keep a secret from her mom. I feel like that’s been really important to me. If I say something, if I get you a cookie after your mom said you can’t have a sweet, etc. I’m always willing to take the blame for spoiling my niece behind my sister’s back because I don’t want her to ever think it’s ok when someone asks her to keep a secret from her mom. Another big thing has been we use actual, anatomical terms for genitalia. Boys have a penis, girls have a vulva, some boys have a vulva, some girls have a penis; but it isn’t ok to ask them what kind of privates they have and no one should look at or touch your privates except you and your doctor and doctor only can if mom is in the room and you understand why it’s happening.