Men have relied on women's sexual faithfulness for ages in order to ensure that her children are also his descendants. Evolutionary theory is congruent with this justification for romantic partners' loyalty.
According to the evolutionary theory of love, love serves to entice and hold onto a partner in order to procreate and then take care of the progeny that results.
From the standpoint of evolution, love is an adaptation, or more precisely, a complicated collection of adaptations, created to address particular issues with survival and reproduction. One of the common sayings is that "love is blind." Some social scientists have asserted that love is a very new concept, dating from just a few hundred years ago.
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