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Most female mammals schedule their sex life into just the couple of days of when they鈥檙e fertile. So why do humans (in theory, at least) do it whenever the mood strikes?

To find out, Dessa explores stinky t-shirt tests, and all sorts of things we鈥檇 better not mention here. Parental discretion is strongly advised.

Image: Metronome with ticking heart (Credit: Getty Images)