However, it's important to remember that in the vast majority of cases, the perpetrator is known to the victim. Often they are closely related. Or a playdate.
So nothing substitutes educating ourselves and our children about body safety. Have these conversations openly (in an age-appropriate manner - there are plenty of resources available for this such as the outstanding Stewards of Children program).
Let those around you know that you take the issue of child sexual abuse seriously, and that you have addressed it with your children - it's worth sharing this even if you haven't really taken any steps to better protect your children, as the predator, sadly, will likely find a more vulnerable target.
But with what we now know, ignorance is no excuse.