Typically, a couple do not fall in love nearly as quickly or as deep as Romeo and Juliet do, reinforcing the idea in the reader's mind that this emotion between the two is most likely lust at this point.
More instances of love as lust comes in the next scene, this time through personification. While Benvolio is ridiculing Romeo for being so depressed over a girl that did not return his love, Romeo replies, "The all-seeing sun/Ne'er saw her match since first the world begun" (I.ii.94-95). Shakespeare personifies the sun as a living thing that has seen the entire world's history, yet Rosaline is the most beautiful thing it has ever laid its eyes upon. Romeo does not reply to Benvolio's doubts with statements of Rosaline's personality or love or any other non-physical attributes, but rather speaks of her beauty. Her beauty is what comes to Romeo's mind first because he is not in love with Rosaline; he has simply been lusting after her all this time. The next day, when the Friar learns that Romeo has fallen out of love with Rosaline and into love with Juliet within a day, he replies, "Young men's love then lies/Not truly in their hearts, but in their eyes" (II.iii.71-72). Friar Lawrence is accusing Romeo of being superficial and caring for only looks alone, as if he were in real love, he would not have forgotten Rosaline so easily and quickly over another girl he had met hours before. Shakespeare utilizes personification in this quote by stating that the love from young men does not live in their heart, but lives in their eyes, loving any girl who is beautiful enough to attract their attention. This not only applies to Romeo and Juliet, but to real life as many teenage boys, even hundreds of years after this play was written, still base their love off looks alone. The Friar is old and wise enough to see through Romeo's false beliefs, immediately recognizing Romeo's emotions as lust rather than true love.
