>>Nothing you will tell them or what you try to "teach" them regarding to the sex topic will register.
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I disagree. Now I'm not saying one or two sessions of "the talk" is going to make a responsible teen, but a good parent role model and many sessions of talking about the benifits of a strong family (i.e., a couple that wants to be togethe and aren't just thrown together because of a pregnancy) will probably make a dent.
But, I agree, one can preach all they want. If it isn't backed up by daily example, its not worth much. Kids are a blank slate. They learn how to be bad and they learn how to be good, and they learn mostly from examples.