Lance, you're gonna have to deal with the horrors of girl puberty first. I would never want to get back on that rollercoaster. With luck, your daughters won't hate you before they start dating (no fault of yours or even theirs, it's just hormones), and will quickly go through the regrettable phase of doing things just to [censored] off daddy.

Teach them the sad statistics and effects of unwanted pregnancy and STDs, and don't be afraid to tell them how you really just hope for the best for them. One of the things that stuck with me was when my dad admitted regretting some of the things he did in his youth and was so grateful - and proud - that I didn't make the same choices. It's easy to think you can scare away a boy's desires, but girls WILL want the same thing, too.

Just as dads must teach your sons to become men, you must teach your daughters to become ladies.