Why do we man hug? Is it simply to fill the gap left by the now pass formality of the all-purpose handshake? Or do we bro hug for some more profound,evolutionary reason;amammalian urge to be squeezed that,liberated fromold fashionedgender conventions,has risen like a phoenix from the ashes in the playbook of male behaviours?

The short answer is: nobody knows.Man hugging remains ariddlewrapped in a mysteryinside an enigma, and searching for itscausation is probablythe social and biologicalsciences' next great frontier; theirFermat's last theorum, or Pandora's box.

Perhaps we'll never solve it, but what wecanhope to decipheris just how to go about achieving a good one. And by good one we mean a hug that doesn't leave you feeling like a twonk in front of an assembled crowd of onlookers.

Indian Prime MinisterNarendra Modi and U.S President Donald Trump made a splash yesterday by going full throttle with a no-holds-barred man hug during a joint press conference.

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To have and to hold: an anatomy of the perfect man hug - Telegraph.co.uk