Do other tween girls experiment at sleepovers?

We didn't have sleepovers when we were young, it was a custom in my country.  But we did go on retreats with our school, all girls and nuns. I was fourteen when a nun helped me with my bra, cupping my new breasts, and pinching my nipples. She kissed the back of my neck, and told me how pretty I was. She reached around and put her hand in my crotch, feeling me, poking me.  Telling me I was so pretty and one day I was going to be a woman and she wanted me to remember her. She kissed me on the mouth and put her hand in my pants.  She sat on the bed, and opened her legs and pulled up her gown and she was without panties.  I didn't want to kiss her but I didn't want to go to hell for disobeying a nun.  I kissed my first girl, between the legs, and licked her. I could not stop.

Maybe that's why I became a lesbian. 

For sure they do and not just at sleepovers. Me and my friends would go to one of our houses after school (usually whoever had parents that were at work) and get naked and finger each other. We were 10 years old when it started and continued till we were about 14. From these experiences we all learned how to pleasure ourselves and have the best orgasms from masturbating and oral. When one of the girls realized that the electric toothbrush could bring enormous pleasure on the clit, we all had to get one hahaha