In Legally Blonde, Reese Witherspoon helps a geeky guy get a date by pretending they had a one-night stand. It's not just sexual attraction she signals—she suggests he's evoked multiple emotional responses: ecstasy, love, anger, hurt, disappointment. That's preselection's power in action. One woman's visible emotional investment makes him instantly more attractive to others. It broadcasts that he has the capacity to move women emotionally and sexually.