Why do girls cross their legs?

Not all women cross their legs. The main reason why most of them do it is not only because it is comfortable to them but also because most of them were raised to know that not crossing them is unladylike, and that a proper lady always crosses their legs when they sit down.

Crossing legs may have many reasons behind,
-Few women sit because of short skirts,
-Women feel comfortable at this position rather then sitting with open legs,
- It shows good manner too at some work place.