| Sumario: | Part of a special issue on new advances in methods of inquiry about sex. The writer discusses the key aspects of a two-phase, adaptive sampling approach for a telephone survey of self-identified gay urban males, pointing out that the study objective required obtaining a probability sample of gay males in the central cities of four urban areas: San Francisco, Chicago, New York, and Los Angeles. He asserts that although it is complex, the two-stage telephone survey design achieves a probability sample of these gay males at a reasonable cost. In addition, he points out that the design is based on an adaptive sampling approach that employs data from the early stages of the survey to enhance the efficiency of subsequent stages. He notes, however, that whereas the design is effective in its key aspects, there are problems that require further methodological research to address. He further points out that although some unexpected problems did arise, the sample design approach helped achieve a probability design under very difficult circumstances.
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