Is there an evolutionary explanation?
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The investment made by mothers in their offspring is so high (esp.1st year) = decreased sex & risk of pregnancy
End of conversation
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Oh cool, I can finally sing Karen Carpenter songs!!
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...with these data, we know another way in which mothers inform males of this, further reducing the risk of pregnancy
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After childbirth, endocrine and cognitive changes in mothers make it difficult to have sex and highly unlikely to get pregnant...
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