The 'Green Line Rule': TikTok's Viral Relationship Test Explained

A fringe social media theory called the 'green line rule' has gone viral on TikTok, claiming that the way couples physically orient themselves in photos reveals who holds the power in a relationship. The core idea: draw an imaginary vertical line through each person — whoever leans toward the other is the submissive, 'weaker' partner, while whoever stands perfectly upright holds dominance. Believers argue this can be read accurately from photos alone, with no other context needed.

The trend exploded when TikToker @jackmacbarstool applied the rule to a high-profile photo of Kim Kardashian and Pete Davidson, pointing out that Davidson leaned noticeably toward Kardashian. He extended the analysis to other celebrity couples including Prince Harry and Meghan Markle, Brooklyn Beckham and Nicola Peltz, and Will and Jada Smith — concluding that in each case the woman stood straight, meaning the men 'failed' the test.

The rule's origins are far from academic. It was invented by a Twitter user known for promoting pick-up artistry and incel-adjacent ideologies, including 'red pill' theory. First introduced in 2020, it sparked as much ridicule as agreement, spawning the 'Don't Lean In' meme mocking men who took it seriously. Body language experts consulted on the theory were unambiguous, calling it 'simply not true' and noting it has no scientific basis whatsoever.

Despite the debunking, TikTok users have embraced it as a self-deprecating trend, filming themselves failing the test with their own partners — and pairing the clips with songs like 'Material Girl,' signaling they're largely in on the joke rather than genuinely alarmed.