Like the original Madonna and child, the young woman on the Tube has her beloved draped around her, his head nestling on her shoulder. As he snoozes, she texts idly with one hand, while the other absentmindedly strokes his arm, soothingly, maternally. But this is no serene scene of mother and son — this is a couple. A couple of adults. If you are forced to use public transport, you see them all the time. Soppy young blokes in skinny jeans, hair artfully arranged to mimic a guinea pig in a hurricane, being mollycoddled by a domineering, post-Spice Girls vixen who, if figures released last week are correct, also earns more than him. Or perhaps he’s stroking her, as though she were a cuddly toy or a security blanket.