Heather is not an unrepresentative case. The author meets patients who cannot sleep, who mutilate themselves, who exhibit every symptom of psychic distress. Often they don't even know why they feel the way they do. As these girls see it, they are acting like sensible, responsible adults: They practice "safe sex" and limit their partners to a mere two or three per year.
They are following the best advice that modern psychology can offer. They are enjoying their sexual freedom, experimenting, discovering themselves. They can't understand what might be wrong. And yet something is wrong. As the author observes, surveys have found that "sexually active teenage girls were more than three times as likely to be depressed, and nearly three times as likely to have had a suicide attempt, than girls who were not sexually active."
And should all this joyous experimentation end in externally verifiable effects--should girls find themselves afflicted with a disease or an unwanted pregnancy--then (and only then) do their campus "women's health" departments go to work for them. They will book the abortion, hand out a condom or prescribe a course of antibiotic treatment. And then they will pat their young patients on the shoulder and send them back into the world, without an admonishing word about the conduct that got them into trouble in the first place.