Europe in the seventies

People very close to me lived in Europe in the seventies (the crazy seventies). It seems that moral attitudes have changed since then, as some of the conducts (especially relating to sexual promiscuity) are something that don’t seem as widespread here as they once were. It is true that the current twenty-somethings are more moralistic than their parents’ generation.

Does it have to do with the rise of AIDS (e.g., it was discovered the year I was born)?