sexual revolution noun2 •A period in which attitudes towards sexual behavior undergo a substantial change, usually in the direction of increased liberality. •A specific period in the 1960s and 1970s during which such change is said to have occurred in Western Europe and North America.The sexual revolution has wreaked havoc on the American family: increasing rates of divorce, illegitimacy, and single-parent families. — 1994 formssexual revolutions