Gender fluidity "refers to a gender expression or gender identity that is fluctuating (i.e., changes over time). The term gender fluid can be used as an adjective that describes expression in the context of a different gender identity (“I am a genderfluid man”) or as a standalone identity term (“I am gender fluid”) (The SAGE Encyclopedia of Trans Studies). The International Encyclopeda of Human Sexuality defines "sexual fluidity, as studied in the United States, denotes a capacity for situation‐dependent flexibility in sexual responsiveness, such that individuals may periodically experience sexual desires that run counter to their overall orientation" (Credo Reference).
Many people who, are not sharing an intersex biological condition, do not feel that they can related to the binary approach to gender in our society. this page provides resources addressing the topic. The material provided is intended for academic research and discussion.