From A Land So Strange: The Epic Journey of Cabeza de Vaca, by Andrés Reséndez (Basic Books, 2007), Kindle pp. 52-55:
ALONGSIDE THESE THREE caballeros [including Cabeza de Vaca], a microcosm of Spanish society was to travel to Florida. The expedition must have included a full complement of letrados, physicians, merchants, artisans, sailors, all the way down to lowly peasants seeking a fresh start. Five Franciscan brothers were to introduce the Indians to the mysteries of the Catholic faith.
The Florida expedition included women as well. Women were a fixture of early voyages of discovery and settlement. According to one estimate, they comprised around 10 percent of all licenses issued to departing passengers from Seville during much of the sixteenth century. In certain years they accounted for as much as 20 percent and even close to 30 percent of all European migrants to the New World. The majority of these pioneering women were married to members of the expeditions, but unmarried women traveled too, including the daughters of families, female servants, and prostitutes.
The lure of the Americas was all too evident for those women interested in marriage. In Spain there was an overabundance of women due to male migration and early death from war. According to the ambassador of the Republic of Venice, in the 1520s Seville appeared to be “very nearly under the control of women,” many of whom earned their living in manly occupations like peonage, masonry, and roofing. The situation was the exact opposite in the Indies, where European women were notoriously scarce and greatly appreciated by affluent but lonesome conquistadors.
Not surprisingly, most women traveled to parts of the New World already settled by Europeans; they were far less likely to risk voyages of exploration and conquest headed for unknown lands. Some expedition captains refused to take females altogether. But Narváez was not among them. The first European women in Mexico had traveled with Narváez in the imposing armada that was to confront Cortés. In the Florida expedition there were ten women, all of whom were married and traveling with their husbands.