Hi Dedicated. There a a lot of people that sext and have phone sex. I personally do not desire that type of sex. But hey you wont catch any diseases! Sorry.... had to say that
But if this girls sexual behavior is strange to you, she is so young, and her moods change so quickly that to me probably should be a red flag not to continue with her.
And please always remember when you are dealing with anyone on the internet they can say they are any age. They can be whoever they want you to think they are. Pictures can also be someone else. So be careful