Sapiosexuality is the romantic and/or sexual attraction to the intelligence of another individual. For sapiosexual-identifying individuals, intelligence is the most attractive feature and takes precedence over all other characteristics.
As defined by Urban Dictionary, a sapiosexual person is someone who finds intelligence and the human mind to be the most sexually attractive feature for a potential sexual relationship. The origin of the word comes from the term "sapiens," which means wise or judicious, as well as the word "sexual."Aug 26, 2014
What Does It Mean to Be Sapiosexual?  There aren't a ton of solid resources defining the terms "sapiosexual" or "sapiosexuality." Urban Dictionary defines as "one who finds the contents of someone else's mind to be their most attractive attribute, above and before their physical characteristics."
  Sapiosexuality is an attraction to someone's brain — their intelligence.  See "The Sex & Pleasure Book: Good Vibrations Guide to Great Sex for Everyone."  Sapient' means wise."
A sapiosexual is someone who is sexually attracted to someone's intelligence, and they prioritize that quality above all others. It's not just about scholarly debates, but passion and proficiency around a certain subject can do the trick.
  The term sapiosexual originated in a 1998 book entry:

I don't care too much about the plumbing.  I want an incisive, inquisitive, insightful, irreverent mind.  I want someone for whom philosophical discussion is foreplay.  I want someone who sometimes makes me go 'ouch' due to their wit and evil sense of humor.  I want someone that I can reach out and touch randomly.  I want someone I can cuddle with.
  Autosexual and autoromantic describes experiencing relationships with one's self and preferring it over any others.