With human cloning technology just around the corner and enough frozen sperm in the world to already populate many generations, perhaps we should perform a cost-benefit analysis.

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In Dr Djerassi's future world, men and women will have their sperm and eggs frozen in their 20s and then undergo sterilisation, free to pursue their professional and sexual interests content in the knowledge that their cells can be safely resurrected and reliably made to unite in a test-tube whenever they want a child.

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In the fullness of time, perhaps men will think likewise and have some of the sperm of their carefree, mutation-free youths frozen in case they fancy a little procreation in their old age.

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One woman decided to stop waiting for the right man at the right moment and explored using donor sperm to have a baby on her own, using her frozen eggs.

WSJ: Why I Froze My Eggs (And You Should, Too)