NEW YORK (AP) - An increasing majority of Americans favors allowing same-sex couples to obtain most of the same rights as married straight couples, but only 39 percent support legalization of same-sex marriage, according to a poll released Friday.

The Pew Research Center said support for civil unions has risen to 57 percent, up from 54 percent a year ago and 45 percent when the question was first asked by Pew in 2003.

Views on legalizing same-sex marriage remained almost unchanged from last year, with 53 percent opposed and 39 percent in favor, the center said.

Supporters of same-sex marriage were divided over the best way to pursue legalization, according to the survey. Forty-five percent of them favored pushing hard to legalize it as soon as possible, while 42 percent said pushing too hard for swift legalization might trigger a backlash against gays and lesbians.

There was more support for same-sex marriage among women, adults under 30 and college-educated people than there was among men, older adults and those who did not attend college.

Asked about homosexual behavior, 49 percent said it is morally wrong, 9 percent said it is morally acceptable and 35 percent said it is not a moral issue.

The telephone survey of 4,013 adults was conducted in August. The margin of error for the full sample was 2 percentage points.

Same-sex marriage is legal in Massachusetts, Connecticut, Iowa and Vermont, and will start in New Hampshire in January. A referendum in Maine on Nov. 3 will determine the fate of a same-sex marriage bill passed by the Legislature in May, and the city council in Washington, D.C., is expected to approve same-sex marriage soon.