Monogamous relationships 5 Monogamy 5 Partner preference 5 Relationship orientation Sexual relationships 5 Living arrangements 3 Marriage 3 Sexual practices 3 Sex 2 Sex (Act) 2 Sex customs 2 Sexual behavior 2 Sexual behavior in animals 2 Sexuality 2 Adultery 1 History 1 Human evolution 1 Non-consensual non-monogamy 1 Non-monogamous relationships 1 Non-monogamy 1 Primates 1 Psychological aspects 1 Same-sex marriage 1 Sexology 1 Social conditions 1 Social evolution 1 Women 1