Man-woman relationships 155 History 87 World War, 1939-1945 51 Families 40 Murder 37 Friendship 34 Fathers and sons 30 more ... Social life and customs 30 Social conditions 28 Good and evil 26 Women 24 Superheroes 23 Film adaptations 21 Police 21 Revenge 21 Fathers and daughters 20 Criminal behavior 19 Teenagers 19 Male friendship 18 Triangles (Interpersonal relations) 18 Conduct of life 17 Investigation 17 Politics and government 17 Campaigns 16 High school students 16 Assassins 15 Love 15 Soldiers 15 Adultery 14 Human-alien encounters 14 less ...