Sex – the sexual act; the state of being biologically male or female; determined by chromosomes; binary and stable; not contradicted by exceptions or altered by social/cultural conditioning or surgery.
Sexual orientation – a pattern of romantic or sexual attraction to another person; homosexual (gay) / heterosexual.
Gender identity – a person’s self representation as male or female; the conformity or lack thereof with biological sex; transgender / cisgender.
Gender theory – a recent academic discipline which examines the ways in which historical, cultural, and social events shape the role of gender in different societies; looks at sexual differences and less binary definitions of gender categorization; denies that there are two biologically determined sexes (“binary essentialism”); has no scientific basis.
Gender – originally meant “class” or “sort;” later, classes of nouns in grammar (masculine, feminine, neuter); today often synonymous with biological sex; there are said to be a fluid range of multiple genders.
Transgender – an umbrella term including transsexuals, cross dressers and drag queens.
Transsexual – more commonly referred to as “transgender;” a person born with male or female sexual organs and chromosomes, with a gender identity of the opposite sex – “a boy in a girl’s body” or vv.; primarily a psychological condition; sometimes the term is used to refer to someone who has undergone surgery to alleviate gender dysphoria.
Gender dysphoria – (confusion)/GD; formerly called “gender identity disorder/GID;” “the presence of clinically significant distress” associated with transsexualism (DSM-V).
Intersexual – Previously called hermaphroditism, now called intersex or Disorders of Sexual Development (DSD); a group of conditions in which sexual identity is ambiguous due to factors such as a discrepancy between external and internal genitals or chromosomal abnormalities, e.g., 47 XXY or 45 XO.