Gender-fluid is a term used in the context of porn videos to describe individuals or characters who do not identify exclusively as male or female. In other words, someone who may express or experience their gender fluidly, which means it can change over time or in different situations. This term acknowledges the spectrum of gender identities and expressions beyond just male and female. In a porn video context, this might include characters engaging in activities that are typically associated with both masculine and feminine roles or preferences. The focus is on the individual's personal gender identity rather than their biological sex or assigned gender.