Biological outcomes (e.g., STI or pregnancy) can confirm sexual activity but provides limited information regarding the prevalence, frequency, or problems associated with sexual behavior. Both positive and negative effects of sexual expression vary depending on a number of highly complex contextual factors. Information regarding the prevalence of specific behaviors is contingent upon accurate, reliable, and valid self-reports of sexual behavior (Catania et al, 1990; Schroder et al, 2003b). Thus researchers need to make two fundamental decisions when they decide to assess sexual behavior: How to gather the data? What data to collect?
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