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Birth control and divorce remain the most morally acceptable of 19 issues measured, and extramarital affairs and cloning humans the most morally wrong.
Seventy-one percent of Americans say they support legal same-sex marriage, a new high in Gallup's trend.
Gallup finds that 10% of LGBT adults in the U.S. are married to a same-sex spouse, and another 6% live with a same-sex partner.
Ninety-four percent of U.S. adults now approve of marriages between Black people and White people. Just 4% approved when Gallup first asked the question in 1958.
Americans are divided in their views of the morality of changing one's gender, with 51% saying it is morally wrong and 46% saying it is morally acceptable.
U.S. support for legal same-sex marriage continues to grow, now at 70% -- a new high in Gallup's trend dating to 1996.
Twenty-nine percent of U.S. adults say it is very important for a couple who has a child together to be married, down from 38% in 2013 and 49% in 2006.
Amid the cascade of negative news, there are some positive notes from the American people.
Over the next week, Gallup will release a series of three articles providing insight into LGBT issues.
In 1981, Americans rated faithfulness as the top feature of a successful marriage. Political agreement and having the same social background ranked last.
In November 1936, a month before King Edward VIII of England abdicated to marry an American divorcee, a majority of Americans favored the union.
In 1952, Gallup asked Americans what kind of job or occupation would provide women the best chance of finding a husband. Office jobs came out on top.
Eighty years ago, just over half of Americans thought a girl needed to be 18 to marry, but 22% put the number under 18 and 25% over 18.
After mostly disapproving of married women working when not financially necessary in 1936, Americans gave slim majority approval to this in 1969.