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Evolutionary psychologyhas attempted to provide various reasons for love as a survival tool. Humans are dependent on parental help for a large portion of their lifespans comparative to other mammals. Love has therefore been seen as a mechanism to promote parental support of children for this extended time period. Another factor may be thatsexually transmitted diseasescan cause, among other effects, permanently reducedfertility, injury to the fetus, and increase complications duringchildbirth. This would favor monogamous relationships over polygamy.