Bras: the double-cupped garments that continue to mystify the male species.
While most girls have learned the mechanics of a brassiere by age 12, men still have a hard time unclasping them in the heat of the moment, even when the reward is seeing boobs. To prove this point, Cosmopolitan presented a bunch of dudes with a mannequin wearing different types of bras to see just how adept they were at unclasping them.
The answer: not very.
Screengrab via Cosmopolitan/YouTube