If you are a Christian and you want your kids to know and understand alternatives to the world's way concerning the "dating scene", sex and the opposite sex, I highly recommend you read some of the following books out-loud with your teen or preteen. You don't have to read them out loud of course, but it will give you a chance to discuss things if you do (and you can do a little editing on the fly for portions you decide may not be appropriate or in keeping with your specific beliefs or the age level of your child). You may leave out some details during a read aloud at a "younger" age (late preteen or early teen) and then set them loose with the entire book at an older age (mid to late teen)
Books like these (about purity and so on) are huge priority, in my opinion, to have in the house if you have older kids (or get them early on for you as a parent to read if you want to get a fresh perspective on how to mold your younger children's ideas about the opposite sex as they grow up). You can't assume that they will just "get" what to do without discussing things in depth and really studying over it and talking things out. This is potentially life changing stuff.
These are all issues that I don't think a lot of parents really spend time on. Kids are being bombarded with "other" ideas even if you limit their T.V. and so on. They will pick it up from their peers and billboards and everything else in our current culture. Even if your kids are too little to read these books to now...I recommend them as reading for you so that you can know how to deal with things as they come up.
Here are some of the book titles:
For preteen boys:
For preteen girls:
For teens (and adults):