'S'exually 'T'ransmitted 'D'isease's'.
God's way of evening out the risks of sex, so not only women have something to lose if they have unprotected sex, but men too.
Use a condom!
James: If I bang this girl and she gets pregnant, there's no real risk in it for me, right? I can just leave her
Gregory: Well.. true. But you could catch STDs and die, or never be able to have sex again.. plus you might have to pay Child Support anyway.
James: .. true.