@tsarstepan,
Take note at 17 the male is also a minor and the law is not the same as when two minors engage in consensus sex as it is when an adult and a minor engage in the same sex acts.
Next the statutory rapes laws in a lot of states depend on the age of both partners in for example in some states a 15 years old can consent to having sex with a partner under 23 but not a 23 years old or older.
So when and if statutory rape occur depend on a lot of factors in most states and is surely not clear when you are talking about two minors.
Also the article did not state this was a case of statutory rape.