PSYCHOLOGY OF EMOTIONS

Detailed explanation-1: -Parental investment theory, a term coined by Robert Trivers in 1972, predicts that the sex that invests more in its offspring will be more selective when choosing a mate, and the less-investing sex will have intra-sexual competition for access to mates.

Detailed explanation-2: -Aggression. Differential parental investment predicts that men are more likely than women to be physically aggressive in order to win at intrasexual competition and emerge dominant over intrasexual competitors (Campbell 1999).

Detailed explanation-3: -At the gamete level, as females produce eggs, which are much larger than male sperms, they have made a larger premating parental investment than males.

Detailed explanation-4: -Trivers’ parental investment model states that individuals facing higher levels of parental investment will become increasingly choosy in their choice of mates. For humans, this leads to two predictions. First, both males and females will be choosier in relationships more likely to lead to the production of children.