From a women's perspective

Every little girl has put Barbie and Ken in a sexual position. Sometimes Barbie on Barbie because there was no Ken around.

As I recall, my friends and I used to role play the act using barbies. We would make the noises, add a skit and the barbies would do the act. At the same time, we made sure there was no adult around because we knew we would get in trouble if we were caught.

Girls have a natural curiosity towards touch. In my opinion, little girls are more sensitive than boys to touch which causes them to have a higher desire for it. Even though no women would admit it, females have a higher sex drive than males. We just know how to please ourselves better. Since we are young, we are told not to touch there, that is a grown up kiss, don't do this, don't do that, you are too young to talk about this, etc. Because little girls know that it is wrong in our society to express that curiosity, so we find healthy outlets with being more affectionate with friends, role play, daydreaming, etc. I am probably just a wrong thinker.