my son is fifteen, began having extreme anxiety issues at twelve and went to live with his father. his father raped him several times and also abused him physically, and threatened him with worse often. I had no idea this was going on until a year anniversary of his stay with his dad. he texted me and told me he was scared then and i didn't know what to say. I went to pick him up, and he has been home with us for almost two years. recently i've noticed he masturbates very often. whenever I am home and his door is closed, I hear him. he has told me that he is feeling scared again, his flashbacks are worsening, and he feels urges to have sex with another boy his age. this boy is coming over tomorrow afternoon and i wonder if I should supervise them, or just let them have sex, as long as the other boy agrees. the problem is mainly that I worry if him having sex will make his flashbacks worse, or is it just him overcoming his fears ?