The study examined the relationship between parental physical affection during adolescence and teenage years and issues like attachment, aggression, sex, and drug/alcohol use. It found that 80% of boys who did not receive physical affection were more likely to engage in risky behaviors, while only 50% of girls showed a relationship between lack of affection and such behaviors. The research suggests that parental physical affection during adolescence is strongly associated with healthier attachment and less destructive behavior in children.