If you suspect your husband or boyfriend of cheating on you, you may be inclined to be extra vigilant as to their whereabouts or want to check their phone for secret messages.
But according to a body language expert, there could actually be other subtle signs your partner is being unfaithful. And it all comes down to how they stand.
Body language expert Patti Wood explained that: "Attraction and sex may create an increase in testosterone and create subtle changes in the body."
Wood points out that alpha body signals do not necessarily mean a man is being unfaithful - so don't go accusing your husband just because they're standing a little taller - but if their body language has suddenly changed, it could imply something more serious.
This could manifest itself in trying to make themselves seem bigger by elevating and pushing out their chest, and pulling back their shoulders, which is often an attempt to give off strong alpha signals.
"The broad leg stance is a particularly interesting," Wood says.
By standing with your legs apart, you create a stable base for yourself. A normal, relaxed pose would see someone with their feet about shoulder-width apart.
Slightly wider than that suggests someone feels grounded and confident.
If someone stands with their feet particularly far apart, this can be a subconscious attempt to make the body seem bigger and wider, which Wood says is "a signal of power and dominance."
"This also takes up more territory and shows domination," she adds.
By taking a wide stance, you're readying your body in case another person attacks, and Wood believes it may show "that a man has a new mate he wants to guard."
Another feature of the wide stance is that it makes the male sex organs vulnerable, which can be a way of sending the message that a man isn't afraid, that they think they're so strong no one will attempt to hurt them.
"This display can be a sexual display (especially men to women) or a show of power (especially between men)," Wood explains.
If a man plants his feet firmly more than nine inches apart, it's primarily a "male pelvic display," according to Wood.
"It's a way of saying, 'this is my space, I own it and I am not moving,'" she explains.
By highlighting the male sex organs, a man is attempting to give off an alpha signal and boast without saying any words, which often occurs as a result of boosted sexual interest.
It might be nothing to worry about, but if your suspicions are already there, it could be something to watch.