In relationships, it is well known than men are mostly jealous about sex, while women are mostly concerned about emotional attachments. Psychologists have conflicting explanations for this, believing it comes either from evolution or from culture. The new cross-cultural research suggests the former is more important. It reveals that Brazilian men are the most jealous; Swedish men and women are more concerned about sex than any other nation, and Japan is the least jealous country.
sex psychology culture love jealousy