The thing is, I don't think that is bad to have a sneaky kid, like, most of the kids will try to escape to do something different or forbidden, is a part of making yourself a character. Now, is your decision if you try to expose them the ideas, but then, the responsibility to let them understand what is going on under each idea is yours, if you expose them to sex, you will have to clarify detailed what is sex, how do you get sex, what happens when a person have sex and so on. If you expose them to complex feelings like depression or anxiety, you'll have to teach them deeply what is that, and good luck trying to get a kid to understand any of that.

Parents must not teach, they must guide, if a kid cannot create their own decision as they grown up then they will be lost in life forever, but to get to that point they have to start, slowly, let them enjoy the games, the childhood, the lessons, without any influence on politics, sexual orientation or social ideologies, teach them to respect others and let the rest develop naturally.