Which moral issues did Edward Westermarck compare across different societies?

In his influential work The Origin and Development of the Moral Ideas, the Finnish anthropologist Edward Westermarck conducted a comparative study of moral attitudes across diverse cultures to support his theory of ethical relativity.12

Rather than suggesting that moral judgments are objectively valid, Westermarck demonstrated that what societies consider "good" or "bad" varies significantly. He compared moral views regarding the following issues:

• Life and Death: The wrongness of killing, including euthanasia, suicide, infanticide, abortion, human sacrifice, and duelling.2
• Social Duties: The obligation to support children, the aged, or the poor.2
• Relationships and Status: Forms of permissible sexual relationships, the status of women, and the holding of slaves.2
• Property and Truth: The right to property, definitions of theft, and the duty to tell the truth.2
• Other Customs: Dietary restrictions, concern for nonhuman animals, and duties to the dead or to the gods.2

Westermarck argued that these variations show that moral judgments are based on emotions of approval and disapproval rather than universal, objective truths.12