If an "anomaly" is detected during the pat-down—or when you go through the AIT scanner— you will be subjected to a "resolution pat-down." TSA agents will take you to a private area and do a more intense pat-down, which includes using the front of the agent's hands for a more thorough search, including the groin area.
This just seems like they can "invent" an excuse to pat you down. And as far as I'm concerned, the TSA can "resolve" the issue in public. I have no desire to get a private room with a TSA agent.