I’ve been thinking about sex in space. Not from any interest in a potential new porn genre, or because I’ve got a chance of joining the 62-mile-high club any time soon. No, my concerns are loftier even than that: I’m worried about the future of humanity.

As British physicist Stephen Hawking said in a talk to NASA last year: “Spreading out into space will completely change the future of the human race and maybe determine whether we have any future at all.”

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