Why Do Girls Go to the bathroom together ??

It Appears that most 75% Of the girls in this world Go together with eath other,

And i have asked some question about that to one of the girl in the class.

lets see what thay have answer:         

The one girl says when the other girl Pie the other

girl hold on the key so no one comes in.

What is your answer ? Answer in the comments. Cya there.