The document summarizes 6 concepts that inhibit the development of a radical theory of sex: 1) Sex essentialism views sex as determined by biology alone rather than being social/historical. 2) Sex negativity views sex as inherently dangerous/negative. 3) The fallacy of misplaced scale treats small sexual differences as major threats. 4) Acts are hierarchically valued with reproductive heterosexuality at top. 5) The domino theory fears permitting any non-standard sex will destroy barriers. 6) There is a lack of concept of benign sexual variation and insistence on a single sexual standard. These concepts rationalize privileging some groups while oppressing others.