The Tube is widely used by all social classes in London because surface streets can easily become snarled in terrible gridlock. The Underground is usually clean and safe, so you can see anyone there, from anonymous people to famous faces.
And like any modern mass-transit conveyance, there are no shortage of attractive men. I've collected ten shots I liked from Tube Crush and put them in a free folder here, with four of them appearing below. Yes, I have a weakness for readers with nice arms. Brains and brawn are catnip for me.