Girls: Why do you not use double ponytails?

Nightingale
Is it because they look childish?
I think it's ridiculously hot. Take a look at these pics:

https://goo.gl/AxTrGZ
https://goo.gl/kRl2Oq

Ok, granted. Those two above would look awesome even bald. But still, I wonder why this hairstyle isn't seen more often.
Updates
+1 y
Ok. They're called pigtails, not double ponytails.

As you probably guessed, English is not my main language.
Girls: Why do you not use double ponytails?
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