I have a kid of my own. I want her to have access to all kinds of book content, sexual or not.
Sexual content in books is not going to ruin children. The vast majority are mature enough to handle it and it will more often than not help teach them to navigate the real world with more nuance than they would otherwise.
It can give words to the actions and feelings they come across, say for example, when a child is sexually assaulted and isn’t aware that it’s wrong, so they don’t speak up about it.
The books are not the problem. Books are never the problem and banning them is a huge infringement of the government on people’s freedom.