Here Scott, let me help you with this.
Imagine your family, imagine your kids (kid), imagine they're smiling, and you're happy, and life is great.
Now imagine you've had sex with "that girl."
Now imagine no family, kid(s) on the weekends (if that), legal bills, 50% of your income gone overnight, your kids acting out because you got a divorce, living in a seedy apartment (because it is all you can afford now), and so on, and so on...
...if that doesn't work, I don't know what will.