This is just not true. I suffered years of rape and physical abuse so I'm as good a candidate as anyone. As an adult, I wondered if I would somehow abuse my kids if and when I had any. When I found out my wife at the time was pregnant, I got very nervous (ANY new father is nervous...period). All I have to say is the second I laid eyes on my newborn daughter, I knew instantly I would never harm a hair on her head! I was quickly shown a love so powerful its amazing. I just can't understand how a parent can sexually abuse their children....If someone harmed my daughter that way, I would likely try to kill them.
Tell your g/f that it just isn't true and have her get more educated....if not, move on. There are many fish in the sea my friend.