The theory that ugly girls flock together as a group, which in turn decreases the overall hotness of said group, bringing the group as a whole down to a -1 on the Binary Scale
The Binary Scale is between 0 and 1, 0 meaning you would have sex, 1 being you wouldn't.
A rolling stone gathers no moss; with some exceptions.
Some people just can't bear the single life, so approximate the rolling stone life by forming a conglomerate stone that they hope will survive rolling without fracturing.