A girl is obsessed with social media, a boy with video games. An adolescent girl defines herself with selfies and visual sexualization. A boy sexualizes his brain with porn use. When I delineate “girls” and “boys” in my lectures, some people say, “But shouldn’t you say, ‘kids,’ or just ‘teens’? Girls look at porn, boys take selfies; girls like video games, boys like social media.” “There’s no doubt about …