sex (sĕks)

1. The property or quality by which organisms are classified as female or male on the basis of their reproductive organs and functions.
2. Either of the two divisions, designated female and male, of this classification.
3. Females or males considered as a group.
4. The condition or character of being female or male; the physiological, functional, and psychological differences that distinguish the female and the male.
5. The sexual urge or instinct as it manifests itself in behavior.
6. Sexual intercourse.