Art duo Gilbert and George have unveiled their latest exhibition - a series of pictures made up of hundreds of postcards and prostitute calling cards plucked from London phone boxes.
The pair, George Passmore and Gilbert Proesch, have worked together since meeting at art school in 1967.
They are known for their immaculate tweed suits and often shockingly subversive and frank artwork involving sexual themes, religious symbolism and bodily fluids.
Gilbert told BBC Radio 4's Today programme they travelled across London to find matching copies of the often sexually explicit cards used to advertise the sex industry.
He said: We were running day and night from place to place because we had to find 13 but every telephone box has only one so we were running all over the place.
It is only London that has these kind of cards, not Europe not in America. It is only here.
His partner, George, said the pair had once been described as normal, conservative rebels, adding: We think it is very good to be normal, you can get away with more.
A statement released by the White Cube gallery in London, where the exhibition is being held, said it describes both a modern urban world and a sexual society that is covert or marginalised within that world.
:: The Urethra Postcard Art of Gilbert and George is at White Cube in Mason's Yard from January 14 to February 19.
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