Sex: biological characteristics of males and females. Gender: social attitudes and behaviours of males and females. Role: behaviour associated with someone who holds a particular status. Gender role: behaviour expected of a female or male in a particular culture. Sex role: behaviour defined by biological constraints. Socialization: process by which people learn the characteristics of their group. Gender identity: a person"s psychological sense of being male or female. Crossdresser & transvestites: a member of one gender dresses up in clothes and other gender specific attire to appear to be a member of the other gender. Transsexuals and transgender persons: a person with the biological sex or one gender who has the identity or self-concept of the other gender and may undergo processes and/or procedures to change that sex or gender. Cisgender: describes people who identify as the gender they were assigned at birth. Intersexed(hermaphrodite): a person who has intersexed sexual organs.