Charlie got neutered today...
Why Male Dogs Are Neutered - Intact male dogs (those not neutered) are prone to a number of annoying behaviors that are directly related to testosterone production. Behaviors such as urine marking; mounting other dogs, objects, and people; roaming in search of females; and aggression toward other male dogs are all caused by testosterone. Having the dog neutered, thus eliminating testosterone production, greatly reduces these behaviors, as well as decreases the animal's level of stress.
Maybe we should start neutering male humans, like say for example George Bush.