This is a very good, if not long, read about God’s design for sex.  It is a very timely read for all those with teen-aged and pre-teen kids.  It is a long article, but worth the read.  An excerpt:

These principles are the real reason for the commands and prohibitions contained
  in traditional sexual morality. Honor your parents. Care for your children.
  Save sex for marriage. Make marriage fruitful. Be faithful to your spouse.

Let the sexual revolution bury the sexual revolution. Having finished revolving,
  we arrive back where we started. What your mother—no, what your grandmother—no,
  what your great-grandmother told you was right all along. These are the natural
  laws of sex.

Link: Cold Type: Designed for Sex.

Jonathan