 Likewise when they attack their children, they express violence towards a narcissistic extension of themselves" (Motz, 2001)
The major forms it can manifest itself are 

Welldon argues that it can be seen as a form of sexualised aggression, and challenges the Freudian view that violence is a uniquely male phallic expression.The reproductive functions and organs are used by both sexes to express perversion.Perverse men use their penises to attack and show hatred towards symbolic sources of humiliation...