By Marion Lloyd, Globe Correspondent
  Mexico City  For Mirka Negroni, a Harvard graduate from Puerto Rico, it
  was a Valentines Day to remember.
  The 36-year-old health researcher was among more than 200 gay and lesbian
  activists who took part in a symbolic mass wedding at the steps of Mexico Citys
  elegant Palace of Fine Arts.
  "Its time that people realize that the traditional nuclear family
  isnt the only thing out there," she said, moments before exchanging
  vows with her partner alongside scores of other couples in an unprecedented
  show of gay solidarity in Mexico.
  More than 3,000 people turned out for the event Wednesday night. Many waved
  the trademark rainbow-colored flags of the international gay pride movement.
  Others wore Ku Klux Klan hoods emblazoned with swastikas, in protest
  against members of Mexicos Roman Catholic Church hierarchy who oppose the
  movement.
  But euphoria dominated the event. Participants were lending support to a
  proposal that would for the first time grant legal recognition to gay unions,
  though only within the federal capital. It would create a version of common
  law marriage, extending inheritance rights and social security to couples who
  currently lack legal recognition in Mexico. The bill would also apply to other
  nontraditional unions, such as the elderly and their caregivers.
  "Its about protecting all kinds of families, and thats a
  wonderful thing," said Negroni, who moved here two years ago to live with
  her Mexican partner.
  She said she became involved in the gay rights movement in Mexico after
  becoming an AIDS outreach worker in the impoverished border region.
  There, she came across cases in which gay men who spent 15 years caring for
  companions with AIDS were later barred from collecting on their partners
  estates. "Its really unbelievable stuff," she said.
  Others said the significance of the gay unions was more symbolic than
  legal. "In Mexico, gay couples are invisible, particularly if they are
  female," said Alejandra Boleaga, 20, who has lived with another woman for
  several years. "This gives us a way to say, Hey, this really is my
  partner and I have the paper to prove it."
  The Valentines Day ceremony broke new ground in a country where macho
  attitudes are an accepted part of the culture. In declaring the right to gay
  unions, activists have also taken on the Catholic Church, several of whose
  members have publicly attacked the movement.
  The cardinal of Mexico City, Norberto Rivera Carrera, described the event
  as "a carnival," adding that participants were "confused about
  the sexuality that God has given them."
  But gay activists have seized on a new political climate, following the
  victory of the first-ever opposition president, to further their equal rights
  agenda.
  "This is the best chance thats come along in a long time. Now is
  the moment to for action," said Yolanda Ramirez, the spokeswoman for the
  umbrella group Campaign for Cohabitation, which represents some 180 gay and
  civil activist groups.
  The activists emphasized, however, that they are not seeking to push for
  legislation to grant full legal status under the specific term "gay
  marriage," nor the right for gay couples to become adoptive parents.
  "We respect the institution of marriage. But we dont want to repeat
  this model," said Arturo Diaz, a representative in the city Legislature.
  Instead, he said activists want "the same rights that most Mexicans take
  for granted."
  A parallel gay marriage bill presented last fall won little support among
  gay rights groups. They accused its promoter, legislator Armando Quintera, of
  trying to gain political mileage by aligning himself with a controversial
  cause.
  "This is not Holland. Mexico is not ready for gay marriage," said
  Francisco Laguna, the editor of a gay mens magazine and one of the events
  organizers.
  Activists have focused their energy instead on establishing a legal
  framework for nontraditional unions, which they said would go a long way
  toward protecting gay couples against discrimination.
  Unlike the United States, where a prohibition
  against sodomy is still on the books in some states, Mexicos penal code has
  never outlawed homosexual acts. But police regularly raid on gay bars and
  pickup joints, invoking an ill-defined statute known as crimes against
  morality, say activists and human rights groups.
  "Its an excuse to extort gay people," said Ramirez, adding
  that real change would only come if supporters managed to get a similar bill
  through Congress.
  "Weve come this far," she said. "The rest is just a
  matter of time."