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.

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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.

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"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.

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