Refers to a person’s biological status and is typically categorized as male, female or intersex. There are many indicators ofbiological sex, including sex chromosomes, gonads, internal reproductive organs and external genitalia.

American Psychological Association. (2012). Guidelines for psychological practice with lesbian, gay, and bisexual clients. AmericanPsychologist, 67(1), 10-42. doi: 10.1037/a0024659.