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"Keep it in your pants!" is another.

'Stop letting the little head do the thinking!" (My fave.)

And, of course, when one is considering making some kind of move on someone that they find appealing, but have no idea how old they are: "If you don't know, you don't go!", meaning that if you don't know how old that person is, you don't go over there in the first place.

"Can you try to keep yourself from fucking everything that moves?" is one that I have used before.