1) Make sure your boys are comfortable around tampons. Preferably still-packaged ones, please! For the younger set, just having the box in plain sight is enough. Once they are driving, there is no reason they can't go buy them for you. If you do try this, be sure to have them purchase a few innocuous items, as well. After all, your goal is to desensitize them, not completely humiliate them. I tried this last weekend and my boys didn't blink an eye when they saw tampons on the list. That's more than I can say for most husbands.
2) Expose them to chick flicks and soaps. This can be tricky. Do not force them to actually watch. However, having General Hospital on the TV, as sort of background noise, will probably be enough to make them subliminally want Luke to finally settle down with Laura (once she is out of her catatonic state, of course).
3) Make sure your boys have at least one good female friend. This is one you have to start early, before they get to the cootie-fearing stage. I remember Moody's very first friend was a girl. In fact, they would have sleepovers, which as toddlers, was perfectly acceptable. Better than at 16, that's for sure!
4) Get them used to apologizing. This is key. They'll need to perfect their technique by the time they're in their first relationship.
5) Insist that your husband pamper you. This is the best way for your boys to see for themselves how a girl should be treated. You should have no problem recruiting your husband, because, after all, doesn't he want your boys to grow up to be respectful and loving men? Of course he does! For beginners, I'd recommend starting with the nightly foot rub.