You want to protect your and/or every one elses' daughters? In reality, the most important thing that you can do is teach your sons that girls/women are human beings, not some alien species or prize to be won. That trying to touch/kiss/etc. someone (anyone) that doesn't want you to is not okay, even when you're both four years old and it's "oh so cute". We shape our children's attitudes from the time they are very young, and as a society we obviously need to do a much better job.
Sorry if this sounds adversarial, but I look at the high school cases that have happened recently (Steubenville, etc.) where both the victims and perpetrators are legitimately children and my immediate thought is who taught those boys that treating a person like that is funny, acceptable, or anything other than horrific? How did they get to the point that they see so little value in the victim that such a violation is nonchalant?
Yes, the male gender can be scum sometimes; the reality is that there are a lot of aspects of our society and culture that normalize the idea that women carry little value beyond their ability to fulfill the sexual fantasies of men. That violence is power and the subjugation and objectification of women is necessary to embody a "real man". Our responsibility to future generations of daughters and sons is to combat those ideas.