Maybe lifting their hands over their head requires less stretching of their inflexible limbs? Media images are insanely powerful, after all. What's Your Prom Dress Style? Since their shirts are longer, if they try the cross-over method, it would get stuck on their head when they extend their hands all the way up above their head. It's nothing to do with girls or boys specifically, but rather the cut of clothes each gender tends to wear. That kicked off the longest scientific experiment known to Tumblr and man. If you tried the opposite way — lifting your hands over your head and tugging from the back of your neck — the shirt would get snagged under your armpits as you put your arms back down to try to pull it over your head.
Katherine. Age: 29.
There are even some people who don't take off their shirts either of these ways.
Hayden. Age: 25.
Battle of the Sexes: Tumblr Teens Mystified by Boys’ and Girls’ Shirt Removal
By crossing your arms and then lifting your hands all the way up over your head, you make room for your shirt to slip right off. Have you ever noticed that boys tend to take off their shirts differently than girls? I've got a few theories, as a cross-over shirt taker-offer myself.