example:
Guy is leaning in, with the girl backed up against a wall. Subconsciously the girl feels "trapped" and it feels like the guy is "chasing." Thus he loses value.
Furthermore, anyone else in the room who happens to glance at the interaction instantly deduces that the guy is chasing. And trust me, other girls will notice. This lowers your value to the entire room. But if YOU are against the wall, and you motion for the girl to lean in (and she will.) then you gain Massive value with her (subconsciously) and with everyone else in the room who happens to glance your direction. It would appear you are being pursued... Which gives you "pre-selection" value -the best kind.