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Why it’s not when you do it, it’s how you do it.
Most female mammals schedule their sex life into just the couple of days of when they’re 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’d better not mention here. Parental discretion is strongly advised.
Image: Metronome with ticking heart (Credit: Getty Images)
Last on
Mon 22 Nov 202103:06GMT
BBC World Service
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- Sat 20 Nov 202119:06GMTBBC World Service East and Southern Africa & West and Central Africa only
- Sun 21 Nov 202110:06GMTBBC World Service
- Sun 21 Nov 202123:06GMTBBC World Service except East and Southern Africa & West and Central Africa
- Mon 22 Nov 202103:06GMTBBC World Service
