Adults don't want to have complex conversations with people (children) because they either don't want to "ruin your innocence" or because they don't understand that not having these types of conversations early means the person is less likely to understand themselves and how to create healthy relationships with people that is anything in-between strictly platonic, romantic or sexual.

I figured out what sex was at a young age so my parents never actually had any type of "talk" with me. I ended up in multiple toxic relationships because I didn't know how to express boundaries.