Anon, there is a particular breed of pedo. It's uncommon, but not rare. This kind of pedo has adequate social skills and frequents /fit/ and has "low" standards for women. He fucks this woman not because he enjoys her, but rather for her children. She keeps him around because there is literally no chance of getting a guy like him in her bed ever again, and society doesn't suspect a thing because he is good looking and can speak to people with a general comfortableness, thus making him desirable while at the same time harmless.