As a father, I didn’t even know what to do or expect, we’re all messy, gross, and dumb at that age. The path I chose, was if they knew enough to ask a question, it was time for a discussion. Just pay attention, offer a safe environment for questions and be honest. Most of what they need to learn the world with teach them. Be there to fact check and maybe even learn together. Last tip… WE made biology gross and taboo, WE can make it less so for our kids.