Mike McBride was driven to adultery by his inability to satisfy his lustful appetite with his wife. Even though he loved her, he craved certain acts which she absolutely refused to participate in. But then, activating his desires on others only made him crave his wife more. It was she he wanted to do these things to. What Mike didn't know was that his wife had been involved in lascivious behavior before they met. Would he find out? Only if she didn't pay the blackmailer.
He discovered his married sister having an affair with his best friend. Instead of being shamed or apologetic, she asked him for help finding someone who could impregnate her.