According to which theory do sexes differ in how much they invest in mating versus parenting?

Question

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The theory that sexes differ in how much they invest in mating versus parenting is known as parental investment theory. This theory posits that because females have a greater investment in pregnancy and lactation, they will be more selective in choosing mates and will typically invest more in parenting. On the other hand, males have a lower investment in producing offspring (since they don't have to gestate or lactate) and therefore will be more likely to mate promiscuously and invest less in parenting.

According to Which Theory Do Sexes Differ in How Much