Probably every age is a fine age to talk to your child about sexuality in age-appropriate ways. Talk to your two-year-old about privacy and differences between boys and girls. As they develop, you can continue teaching them about their body and later about the temptations and threats that exist in the world and can harm our bodies. Sex education is a process, not an event. You are not looking for a time to have one big awkward conversation. You are looking for many opportunities throughout your child’s life to advance the process of teaching them of God’s blessings and intentions for them and their bodies.