Maybe a real nonchalant conversation of, hey just a heads up that you'll be learning about this in school next week. I didn't want you to feel uncomfortable about it or be caught by surprise. And then a kind of basic overview. Then follow up with a conversation afterwards?
I feel it is kinda pointless to keep them out of class personally. The kids will be talking about it later and I would rather the kids be have access to the correct info directly from an educator than to just get hear what the kids say about the class. Plus, you don't want to set him up for teasing. That's just my two cents.
ISO......BG 4.0 in aplix