From Sir Thomas Malory's Le Morte D'Arthur, Book XVII, Chapter XXV:
But nowadays men can not love seven night but they must have all their desires: that love may not endure by reason; for where they be soon accorded and hasty heat, soon it cooleth. Right so fareth love nowadays, soon hot soon cold: this is no stability. But the old love was not so; men and women could love together seven years, and no licours lusts were between them, and then was love, truth, and faithfulness: and lo, in like wise was used love in King Arthur's days.Look at that! Love is now* nothing more than slaking one's lust. I blame the Millenials.
* - Well, maybe not now, per se. More like 530 years ago. Still, I blame the Millenials.