As this table reveals, the most dramatic change to occur is that a large majority of Americans now believe that gay and lesbian sexual relations are morally acceptable. Public opinion on this issue has shifted in a major way since 2001. Back then, most Americans believed that same-sex behavior was immoral; however, that has all changed in response to the important social and political gains made by the LGBT+ community in the last few years, including the fact that same-sex marriage is now legal throughout the nation.

Sex between unmarried men and women and divorce were rated as the most morally acceptable in 2001, and they continue to lead today. By contrast, both consensual non-monogamy (specifically, polygamy) and non-consensual non-monogamy (cheating) continue to be the least accepted. However, it is interesting to point out that the number of Americans who think polygamy is morally acceptable has nearly tripled over the last 17 years. It would be interesting to know whether moral acceptance of other forms of consensual non-monogamy (think polyamory, open relationships, and swinging) has changed over this same time period, too. Unfortunately, Gallup has not routinely inquired about the acceptability of these other relationship configurations, which means we can't really say what, if any, changes have occurred (although I would hypothesize that their perceived acceptability has increased as well).

One other finding of note is that while attitudes toward abortion have remained pretty flat since 2001, attitudes toward stem-cell research have become quite a bit more favorable in that same time period.

With all of that said, it is important to highlight that while Americans' attitudes overall are the most sexually liberal on record, the numbers in the table above reveal that a substantial minority continue to hold very traditional and conservative sexual values. This cultural divide is, of course, very regional, with attitudes being more liberal in the northeast and west, and more conservative in the south. This helps to explain why sexual morality issues are so much more controversial in some states than others.

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