Futurism books and documentaries of the 1970s were adament that attitudes towards sex and sexuality would change drastically by the year 2000.
What I call civilized adultery will exist a great deal more in the 21st century. People will agree with each other, husbands and wives, to have adulterous affairs from time to time quite above board instead of having them secretly behind each other's backs. They will not get upset about these any more than lots of people in other societies in the past, and present, do not get upset about adulterous affairs.
The excerpt above is from an essay by Albert Ellis, featured in the 1970 book Prophecy for the Year 2000.