Mexico's efforts at sexuality education have progressively evolved, from a biological focus in the socialist era in the 1930s, to adding a demographically concerned family planning component in the 1970s and including a wider reproductive health perspective in the 1990s, and finally shifting to a broader sociological context in the early 21st century. Opposition to sexuality education rose steadily in the time period considered, with a growing range of more organized and well-financed actors. Despite this opposition, alliances between academic, government, civil society, and NGO champions have helped ensure sustainability.
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