Hear, hear ladies.....
PS: "We must always remember that we are not raising children we are actually raising adults. The lessons they learn now will carry the through the rest of their lives."

Sooooo exactly true. This is my personal parenting philosophy, and stated in my parent handbook. We must make choices when raising children that are LONG term. That is what can be so tough. Sure, it might be EASIER to do things differently, RIGHT NOW. But that will have adverse effects in the future.
And on the original topic; I have never had to resort to biting a child back, luckily. But I do think that sometimes a firmer hand is required when a child is aggresive. They NEED to know that it is not okay, it hurts and will not be tolerated.