Demisexuality is a sexual orientation in which an individual does not experience primary sexual attraction (based on sight or smell or other instantly available information), but instead only experiences secondary sexual attraction (after knowing more about the person than just their looks). How much a demisexual individual needs to know about a person and for how long they need to know about them for secondary sexual attraction to develop varies from person to person.

The term was coined on February 8, 2006 at the AVEN Forums by a member named “Sonofzeal”. Based on the theory that allosexuals experience both primary and secondary sexual attraction and asexuals don’t experience either, based on the need for a term to describe those who experienced one but not the other they proposed the term demisexuals. Wikipedia