Triggers of women’s jealousy and mate guarding, as a consequence, should focus heavily on signals of these kinds of losses, such as a man becom-ing emotionally involved with another woman. Emo-tional involvement is a signal of the long-term com-mitment of resources to the partner with whom one is involved [15]. Sexual and emotional infi delity in a partner, of course, are correlated in nature [16]. People tend to become emotionally involved with those with whom they have sex. And people often become sexually involved with those they are emotionally close to.

All these confl icts occur because the deploy-ment of a successful reproductive strategy by one individual can interfere at multiple points with the reproductive strategy pursued by the other – a phenomenon called “strategic interference” [2].