Was out in Kew Gardens with a friend yesterday and he asked me what my take on snogging on the tube was. "It doesn't really bother me", I replied "as I'm usually doing something else". (That's so not meant to sound like that - I meant I'm normally reading or something) But it reminded me that I had taken a picture over Xmas of a couple snogging on the platform at Angel tube station. I told him that it reminded me of the Robert Doisneau picture - of course I couldn't remember Doisneau's name at the time (let alone pronounce it), so I said "You know the French one, really famous black and white picture".
Anyway, I dug out the picture from the recesses of my digital camera's memory and of course it's nothing like Doisneau's but the sentiment remains similar I think, particularly with the apparent obliviousness of everyone around them.