The ceremony was at a park across from the Fort Worth Convention Center, where some 3,000 people are meeting for the United Methodist Church's general conference. It is held every four years to set church policy.
Methodists this week rejected replacing a sentence in its Book of Discipline - which says the church "does not condone the practice of homosexuality" - with other phrases, including one saying Christians differ on the issue. The measure to change the language also was rejected at the last conference in 2004.
Methodists this week also voted against a proposal to change a policy allowing pastors to keep gays and lesbians from joining the denomination's churches.
"There was a lot of robust debate as there has been for 36 years, particularly over the phrase that refers to 'incompatible,'" said the Rev. Gregory V. Palmer, president of the church's Council of Bishops. He also called for finding common ground.
At the ceremony, some said that acceptance of gays in some churches encouraged them but that the denomination as a whole had a long way to go.
No clergy member presided over the commitment ceremony of Julie Bruno and Sue Laurie of Chicago, a couple for 25 years, although about three dozen ministers attended.
Officiating at a same-sex union ceremony violates church rules for clergy and would leave them vulnerable to being charged in Methodist church courts. In 1999, a senior pastor in Omaha, Neb., was defrocked after a church trial for performing a same-sex union.
"The United Methodist Church has been and continues to be both blessing and burden to us," said Julie Bruno, one of the women getting married. "When the church turns her back on us, withholds blessing from us, does God withhold blessing? Does God stop loving us? We continue to be the church to and for each other. We continue to be the instruments of God's light and love."
The Rev. Julie Todd spoke during the Friday ceremony and led the communion. Afterward, she said she doubted her role would subject her to any church disciplinary action, but if so she was prepared.
"I believe so strongly that this is the role of the church and of the ordained clergy in blessing loving relationships that I am not concerned about the consequences," Todd said.
After the service, Laurie and Bruno said they turned down many ministers' offers to officiate.
"The message was less about upsetting people and more about being role models and for people to know that these ceremonies are going on," Laurie said.
