The Doctors Dark Secrets

There had been some arguments in Doctor Larson's family. The son wanted to bring home his girlfriend, and another person. It took some input from a friend, to say that the son Bruce was right. It would be like you invite your sister, and another friend. So, this argument was settled. Then, Doctor Larson's wife Linda heard him talking to a woman on his phone, and started to make some research. It turned out that our doctor was living a double life, and was well known to the police. What dark secret was hiding in our doctors closet?