What Sandbox Game Should I Get?

I love Sandbox games, so GTA came to my mind. My parents said no, because of killing cops and sexual content. I already play Minecraft, but I'm looking for a sandbox game that doesn't have a lot of sexual content, and if it does, no graphic nudity, or it should be avoided easily. Any thoughts? I heard Assassin's Creed 2 is a great one. What do you think?

Added (1). I'm looking for a game that takes place in the city like GTA, or something like Red Dead Redemption. I can't play RDR, but since it is Western, I should be able to get it next year. I can play any games, no matter the rating (E-M) just no GTA.

There's heaps the most popular being Minecraft
But there's also others like day z if you are interested in that sort of thing

Minecraft, once you know what you're doing and really get the feel of the game it's amazing.

You're too young.

Stick to Minecraft.

Garrys mod

InFamous 1 & 2 are very good games if you have a PS3. If you don't have a PS3 there's Prototype 1 & 2 which are good, but I enjoyed Infamous series more. Neither has nudity and almost no sexual content that I remember.