When it comes to gender expression, don't assume that the person wearing the pants at the wedding plays a dominant role in the relationship, she said.

CNN: SHARE THIS

Gender expression and identity refer to the gender you feel comfortable expressing and identifying with, which might or might not be aligned with the biological sex you were assigned at birth.

CNN: Youth: Straight, LBGT or 'other'?

"I do think that the visibility of models like Pejic is normalizing nontraditional forms of gender expression, which is fantastic for folks out there who don't identify with the gender they were born with, " says Lena Chen, a gay rights advocate and body politics writer.

CNN: High fashion, minus the labels

Far too often, we hear shocking and tragic stories about transgender people who have been assaulted and even killed because of their gender identity or expression.

WHITEHOUSE: Transgender Day of Remembrance

Ms. Keane, who has raised two daughters who identify as lesbian, said many gay foster-care children struggle in homes that are intolerant of their gender identity or expression.

WSJ: New York City Seeking to Attract Gay, Lesbian Foster Parents

During the opening remarks, the UNESCO representatives, Gulser Corat and Wijayananda Jayaweera, underscored the importance of the resource book's topic, which is intrinsically connected to UNESCO's global priorities of Gender Equality and Africa, and its mandate to promote freedom of expression.

UNESCO: MEDIA SERVICES

Insofar as music as an expression of human emotion, it has the unique power to surpass the limits as race, creed, gender, and sexuality.

WHITEHOUSE: The Ambition to Inspire All