I can see why kids may not consider oral sex as sex. They probably feel that it is more like mutual masturbation (hope I can say that!) And everybody says that's ok, unless you find yourself in "polite" company, of course.
Re the "first needle", my daughter's doctor told her that even if the second shot is way past the due date, the 2nd and 3rd needles can resume without having to start the series over from beginning.