The idea that heterosexuality
and heterosexual behavior patterns
are accepted as "normal
" and that things that are not heterosexual, like homosexuality
If my postmodern anthropologist wife were here, I could tell you who coined the term and when. (She is here--she tells me the term was coined by the poet and author Adrienne Rich.) It's used a lot by queer theorists and other social scientists to describe the bias of our current society and societal mores, and the implicit assumption that people who act a certain way are wrong.