Making an assumption means to take something for granted or accept it as true without verifying. In psychological practice, assuming refers to the act of presuming that all individuals identify within the binary model of gender (male/female) without considering other possibilities.
Related terms
Stereotyping: Assigning certain characteristics or traits to a group of people based on assumptions or generalizations.
Genderqueer: Refers to individuals who don't identify strictly as male or female but may embrace both genders or neither.
Non-binary: Describes individuals who don't exclusively identify as male or female but rather exist outside of this gender binary.