Why are on average, women's shorts a lot shorter than men's shorts?

Why are on average, women's shorts a lot shorter than men's shorts?
Look at the photo above... nothing out of the norm, just a regular couple in shorts.

But why are her shorts so short compared to his... his are below the knee, hers barely cover the thighs.

Why are on average, women's shorts a lot shorter than men's shorts?
Here's an image of men's boxers as well... even men's underwear are longer than most women's shorts.

I get that men are men and women are women, but why such a staggering difference?

One female friend of mine said she just can't find longer shorts. However, another one said that longer shorts are indeed available, but she thinks the short ones look better on her.

What is the true reason?
Why are on average, women's shorts a lot shorter than men's shorts?
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