My opinion is, chemistry is still an important part of attraction. Not the most important, but vital. What would you do with a guy who fits all the rational and intellectual criteria and tell him stoically you married him because of such hard and cold facts, without any chemistry between you two? You gotta have the spark and compatibility. I so agree with the second paragraph as quoted here:
“Love is the “most fundamental passion” which is “aroused by the attraction of the good” (Catechism, no. 1765). As Dietrich von Hildebrand might put it, love involves anaffective response to a perceived value. It is not merely an intellectual exercise and a stoic resolution of the will. Genuine affective responses cannot be commanded, though they may be encouraged. [4] “Whenever a true value affects us, whenever a ray of beauty, goodness or holiness wounds our heart…a certain actual change is produced in our being…” (Hildebrand 231).
…In purifying our souls we become more authentically beautiful. If not physically beautiful by movie star criteria, the harmony and clarity of our souls, more purely reflecting the image of God who is true Beauty, will be mysteriously attractive. As Pope Benedict XVI wrote, then our very lives will become “luminous also to others and to the world.”
Writing the Stories of My Heart 