Behavior is a much more reliable barometer of feelings than words. Sex is a form of inebriation affecting speech and judgment. If the feelings behind the words are lasting, the words will get repeated outside the bedroom. How and why we lie about love is, to some degree, a matter of gender. Women tend much more toward literary scrutiny and close textual analysis than men.
Words show women where they stand in a relationship.
They gather and hoard those words and phrases that are most redolent of romantic commitment. The woman who, in this analogy, is the drinks machine collects each coin as it drops down. For her, each is shiny and beautiful. Each is a promise. These coins, spent so guilelessly and with no thought for the future, are her evidence of his love and the promise of devotion.