Dana Khalili replied 18th Jan '18:
While intelligence is a mental attribute while sexiness is a physical attribute, the two can become connected because of our human attraction to filling what is missing in our lives. For those whose predominant characteristic is sexiness may look for those whose predominant characteristic is something else, like intelligence to compliment their own life and bring balance.
That being said, "sexiness" is a package comprising many elements such as attitude, state of mind, energy and passions, not just physical attributes. With physical beauty being in the eye of the beholder, sexy becomes subjective to each person, and boils down to having the right mix of attributes, for which intelligence - both emotional and mental - can be apart of.