Upset in Response to a Sibling’s Partner’s Infidelity

Existing evidence suggests that the psychological design of romantic jealousy differs for men and women: Men are more likely than women to report greater upset in response to a partner’s sexual than emotional infidelity, whereas women are more likely than men to report greater upset in response to a partner’s emotional than sexual infidelity. However, the observed sex difference can be explained after the fact by both an evolutionary analysis of...