Final answer:
Gender crossing refers to examples where individuals do not fit into traditional male-female binary. Examples include Māhū in Native Hawaiian culture and intersex children in the Dominican Republic. In precolonial Igbo society, women could become men and marry women.
Step-by-step explanation:
In various cultures and time periods, there have been examples of gender crossing, where individuals do not fit neatly into the traditional male-female binary. For example, Native Hawaiians celebrated and respected the Māhū, third gender persons, while in the Dominican Republic, intersex children are called "Geweckes" because their gender identity often becomes apparent later in life. In precolonial Igbo society, women could be ritually transformed into men and engage in female-female marriages as husbands. These examples demonstrate that gender categories are social constructions that can vary across cultures.