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I put every one of them into different rooms, yet they somehow keep having kids, and it's getting crowded. I don't want my place to be endless z levels of room, help. Why do they keep reproducing?

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Which version are you playing on?

On the live version (0.9.0.13), you can edit the max population. There's a button on the top left of the screen that lets you do so.

On the beta version (0.10.0.0+), you need to middle mouse click the human population (should be on the top middle stat bar) and set a max there. Alternatively, you can disable the bedroom function for the home. That'll keep them from procreating. But, that's on a per-household level and that might be tedious.