If laws prohibiting sexual harassment had stayed with sexual harassment it wouldn't be an issue. When the laws moved from objective harassment, direct statements, physical manifestations to subjective harassment, a "look", or hostile work environment that's where the laws started being meaningless.
The supervisor demands sex from a female subordinate or she'll be fired. That's sexual harassment. A co-worker squeezes a breast. That's sexual harassment.
A woman finds out that a co-worker has a photo of a naked Lady Gaga taped to the inside of his locker is NOT sexual harassment. A couple making a date for later after work is NOT sexual harassment to an evesdropper.
I recall a specific instance from some years ago, a nurse at San Pedro Peninsula hospital reported a surgeon for creating a hostile work environment because she saw him kissing his wife goodbye in the parking lot when he was dropped off at work. She got a few thou out of that one.