My question involves criminal law for the state of: TEXAS

My 13-year-old daughter is receiving messages from a 14-year-old boy that I consider disgusting and would like to know if there is any legal action I can threaten or do I just have to hope his parents have him stop because "it's wrong?" Aside from the foul language (which I guess may not be illegal to use over the internet because of "freedom of speech," but am not really sure of the legality), he talks about "when we go out I'm going to want to feel you up," speaks of her "t*ts" (his words, not mine), and mentions "fingering herself" to understand what he's talking about. Needless to say, I find it horribly disgusting and she write to him that she's not interested in that, not interested in knowing about it, and thinks it's disgusting. However, she is a very nurturing person, tells him to change the conversation, and considers him a friend. I'm appalled and revolted that he's even possibly put the images in my daughter's head and want to approach the boy's parents to let them know what kind of messages he's sending, but want to know if there is really anything legal with which I can threaten to charge him (or his parents). Even if it's minor, I'd like him (and his parents) to know he should be held accountable for his actions.

To sign up for this site, I know we had to agree to "rules of conduct" such as "You agree not to post any ... obscene, vulgar,... sexually-oriented or any other material that may violate any applicable laws." Does Facebook or AOL or cell-phone carriers have similar rules/law that can be considered broken if such has been sent over the Internet or phone? And is "obscene" and "vulgar" too vague to hold up in court?

Thank you for any help.