Smith told HuffPost UK: "We saw the man with the sign and, after standing and watching people respond to him (mostly disagreeing) for a little while, we decided to make a point by kissing near him.
"The photograph was taken by a passer by without our knowledge, and then shared on Facebook where mutual friends made us aware of it.
"We're really pleased with the positive response it has had- there have been lots of supportive comments and the photo has been shared loads. It's strange to think that a spur of the moment display of defiant affection would create such a stir!"
