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Sexual fluidity has been defined as a capacity for situation-dependent flexibility in sexual responsiveness, which allows individuals to experience changes in same-sex or other-sex desire across both short-term and long-term time periods. I review recent evidence for sexual fluidity and consider the extent of gender differences in sexual fluidity by examining the prevalence of three phenomena: nonexclusive (bisexual) patterns of attraction, longitudinal change in sexual attractions, and inconsistencies among sexual attraction, behavior, and identity. All three of these phenomena appear to be widespread across a large body of independent, representative studies conducted in numerous countries, supporting an emerging understanding of sexuality as fluid rather than rigid and categorical. These studies also provide evidence for gender differences in sexual fluidity, but the extent and cause of these gender …