An umbrella term for a wide spectrum of natural variations in sex characteristics involving chromosomal, hormonal, endocrinological, and/or anatomical configurations that do not appear to fit the standard definitions of female and male (Serano, 2018).
Shawn has XXY chromosomes, a relatively common intersex variation.
Serano, Julia. “Julia’s Trans, Gender, Sexuality, and Activism Glossary.” Juliaserano.com, 2019.