Photojournalist Richard Lam took the photo below and it's gone viral - and yes here I am adding to that :) An Australian guy kisses his Canadian girlfriend to comfort her after she is caught up in the Canadian riots.
I think several things make this photo powerful. Love surrounded by anger, caring surrounded by violence. A moment of calm in the chaos. That no one else in the photo is even aware of them, and they are aware of only each other.
This photo is a great symbol for what romance writers are trying to create. Two people at there center of a story, who find love regardless of what surrounds or challenges them, and who are there for each other. And of course there are other elements as well, tension, excitement, romance, etc... you get the picture - literally in this case :)