pulation were not included in any summaries or analysis of trends since their participation seldom continued for a long period of time. Although Masters and Johnson expected difficulty in securing subjects this did not prove to be the case. They worked with a population that developed primarily from the metropolitan university-hospital community in which the study took place. This resulted in a population that was nearly all white, intelligent, and well educated. The population expanded and diversified, however, as clinical clients (presenting sexual or conceptive inadequacy) joined and, when the study was well-established, volunteers were added from "a wide variety of sociogeographic and educational backgrounds" (11).
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