|these are young girls sending nude pictures. They obviously do not know about self respect.
Did it ever occur to you that a girl might share pictures of her body BECAUSE of self-respect, because she thinks she is beautiful and wants to share her beauty with people who will appreciate it?
My parents raised me to feel joy and pride in my body and sexuality. Then, when I was a teenager and they found out I was having sex, they jumped straight to the conclusion that I was deeply troubled and had no self-respect!
Because I trusted and respected my parents, I worried over the issue for a couple of years, scrutinizing my every move and praying for guidance...but I could find no evidence that my sexual activity was motivated by anything but loving my body and the things it could feel, being excited by boys' bodies and making them feel good, and exploring this new way of connecting with another person. The only damage to my self-esteem came from feeling judged and insulted by my beloved parents.
So please don't jump to conclusions about these girls.
The serious issues here, IMO, are:
1. the use of electronic technology to transfer these photos, which could lead to their misuse. Your son and his friends need firm guidance about why this is such a bad idea. Taking away the cell phone is appropriate.
2. the possibility that your son is uncomfortable being pressured by these girls to show them his private parts. You should talk with him about his right to privacy and how to say no.
Sorry you had this shocking experience! It's bad enough having someone's breasts pop up on your screen without warning when it's some random porn-spam person; it must've been really weird to realize they were the breasts of someone you know and think of as a kid!