The asexual community has put a great deal of thought into how to define various kinds of attraction. For a starting place: http://www.asexuality.org/wiki/index

The asexual community has put a great deal of thought into how to define various kinds of attraction. For a starting place: http://www.asexuality.org/wiki/index.php?title=Lexicon http://www.asexuality.org/wiki/index.php?title=Lexicon