Langdon chart or Langdon diagram (Kevin Langdon, mid 1960s):
A chart composed of lines connecting the names of those who have engaged in sexual activity together. In more refined form, different kinds of lines indicate who is attracted to whom and distinguish past and present relationships. The chart was originally developed to illustrate who within San Francisco Bay area science fiction fandom had had sexual relations with whom.
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A chart composed of lines connecting the names of those who have engaged in sexual activity together. In more refined form, different kinds of lines indicate who is attracted to whom and distinguish past and present relationships. The chart was originally developed to illustrate who within San Francisco Bay area science fiction fandom had had sexual relations with whom.
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