A more thorough explanation:

A peeping Tom is someone who secretly watches people, usually through a window or door, while they are doing private things like undressing or having sex. This is illegal and can result in criminal charges and civil lawsuits.

For example, in California, it is against the law to look into private places in person or with devices. In Georgia and South Carolina, being a peeping Tom is also illegal. In a case in New York, an employee was awarded damages for emotional distress when their employer installed a camera in a workplace restroom to spy on employees.

These examples show that peeping Toms violate people's privacy and can face serious consequences for their actions.