Humans living in space for months, years, or even generations will need to navigate sex in a zero-gravity world.

As a quartet of astronauts make their way to the far side of the Moon, far-fetched notions of human colonies on the satellite or even Mars - a three-year return trip - are again getting an airing.

In October of last year, Jeff Bezos told a crowd in a sizable conference room in Turin that millions of people would live in space in a few decades. Not as a ...

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