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This audiobook is narrated by a digital voice.How much sex is normal? How often do couples really have sex — and are you having enough?How Much Sex Is Normal? explores the science of sexual frequency, libido, sex drive, relationships, age, parenthood...

This audiobook is narrated by a digital voice.Eight hours. Everyone knows the rule. But what if it’s the wrong question?How much sleep do you really need — and what actually happens when you consistently get less?How Much Sleep Do You Really Need?...