Chuck Colson writes:
"For example, there is the cost in treating sexually transmitted diseases. Research shows that more than half of all Americans will contract a sexually transmitted disease at some point. The cost: Some $17 billion in higher taxes and health insurance costs every year. And that does not include secondary costs, like treating cervical cancer, infertility, birth defects, and brain damage. And yet, our government does little or nothing to discourage premarital sex.
And then there are the huge costs of out-of-wedlock childbearing. Welfare costs alone to single-parent families amount to $148 billion per year. We pay indirectly, as well, through costs associated with child abuse—much more common in single-parent homes—and in higher crime rates."
This confirms the clear teaching of Romans 1 and 2 that where sin increases, God's wrath against that sin also increases... not only in the age to come, but in the age we live in.
I am not convinced that these kinds of stats will win any argument, but it reminds me that one tool in our evangelism is to point out what sin pays: slavery and death. Those two words are far more than metaphor.