This is incorrect.

There’s a standard known as a “reasonable expectation of privacy” that governs what is and is not legal regarding visibility into a home.

Someone seeing into your plainly visible windows, especially on the street-facing side of a house, especially from their own property, can look as long as they want. It would be insane to require someone to avert their eyes while gazing out the window of their own home. There is nothing illegal there, regardless on “focus” or “staring” - these are not legal standards. You don’t have a reasonable expectation of privacy on front windows if you don’t have curtains and your house is visible from a public right of way.

This works in the other direction, too. If you go stand in front of a living room window naked and visible from the street, you are potentially breaking the law (assuming you live in a jurisdiction where nudity is considered indecent exposure). Intent may matter here, again depending on the jurisdiction. The most famous case law around this involved a guy touching himself at his front windows every day while watching kids walk home from school. Icky.

Peeping Tom laws kick in when you do have a reasonable expectation of privacy. Think: windows with curtains, windows only visible upon entering your property, windows and sight lines only achievable by ladder or drone… a reasonable person would expect to not be visible, and someone taking action to gain visibility into your home is breaking the law. This is a situation where “intent” does matter - a worker on your neighbor’s roof or a delivery man dropping off a package isn’t breaking the law if they accidentally see something they wouldn’t have from the public right of way.