http://findyourfacemate.appspot.com There's an interview with the founder at http://pickuppodcast.com/2012/04/30/episode-160-christina-bloom-findyour...
Hindsight? Partners eating, doing, living similarly? Who knows?
I looked through my past partners' photos. There was definitely more intensity with more similarity.
What's your experience? In the interview, Bloom mentions putting one's thumb over the forehead to account for hair differences, thereby make comparison easier.
Could this connect to porn in the sense that we may be seeking a certain face? It could be more than novelty in that we're somewhere certain there's a right, ideal, or by some other measure more desirable face.
One downside to this could be that it enables limiting beliefs about potential partners.