Watch the whole video. They explain it’s because women have shorter feet so they wind up closer to the wall.
When the husband stands at exactly the same distance as wife, he can do it too.
I get the explanation - but I don’t know. The guy is taller too. Although that might put him at the disadvantage because his center of mass is higher.
https://www.youtube.com/watch?v=sZbrVxcvIyE
Heh - here is another similar challenge. Most women can do it because their center of gravity is lower. Probably due to extra mass around their hips - or their pelvis. A woman’s pelvis is wider and shorter than a man’s. That would seem to be a key factor there with regard to center of mass.
Another article was saying how most men have more mass (muscle?) in their upper body than women.