E.g., see the varying estimates for U.S. adults. read.dukeupress.edu/demography/a...

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No single survey is a definitive benchmark for sexual identity. Among adults these estimates vary considerably from survey to survey. This is one wave with a response rate of about 31%. There is a change that deserves study, but “free fall” does not describe it.

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The biggest shift in the series came in 2021, when CDC changed the answer choices and moved the survey from spring to fall. Among 9th graders, 85% identified as heterosexual in 2019, 73% in 2021 and 2023, and 80% in 2025. About half of the 2021 drop went to options that did not exist before.

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Each YRBS wave is a new sample of students, not the same students over time. Comparing across waves, the prevalence of bisexual identification was 11.0% among 9th graders in 2023 and 10.1% among 11th graders in 2025. The lower prevalence appears only among 2025’s 9th graders.

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Among 9th graders, bisexual identification fell from 11.0% to 6.9% between 2023 and 2025. That is where it was in 2019 (7.0%). No other grade had a significant change.

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