Another way to codify your relationships--this one courtesy of 16 different personality types, or exchanges. After a hundred or so pages of summarizing assorted findings in the psychology of personality (the prevailing wisdom on the self-centeredness of infants as necessary for biological survival, say, or a treatise on the incest taboo as a cross-cultural or ""universal norm of exchange), the authors get into heavy-duty pop. Meet, then: the controlling exchangers (product of domineering parents, hate to be alone, like to be on top in sex); the dependency exchangers (mama's or daddy's boy or girl); the extrinsic exchangers (seek approval of others); the non-trusters, etc. In order to place yourself in the line-up, you're encouraged to fill out an appended 20-or-30-minute questionnaire; that way you'll also be able to determine which ""exchanges"" are most compatible with yours. Piffle from just about any angle.