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Attitudes to casual sex range from conservative and religious views, the extreme of which may result in imprisonment or even capital punishment for sexual relations outside heterosexual marriage, to liberal or libertarian views, the extreme of which is free love.
During the sexual revolution in the United States and Europe in the 1960s and 1970s, social attitudes to sexual issues underwent considerable changes.
Instead, they found that what mattered most was the goal individuals had going into a relationship.
Individuals who started by hooking up tended to develop a full relationship later on if that was their goal going in.
Researchers say that what differentiates hooking up from casual sex in previous generations of young people is the "virtual disappearance" of dating, which had been dominant from the postwar period onwards.