Page "Human variability" Paragraph 22

Membership or status in a social group may depend on having specific values for certain attributes.

It is not unusual for people to deliberately try to amplify or exaggerate differences, or to conceal or minimize them, for a variety of reasons.

Examples of practices designed to minimize differences include hair straightening or skin bleaching, plastic surgery, orthodontia, and growth hormone treatment for extreme shortness.

Conversely, male-female differences are enhanced and exaggerated in most societies.