Here's an explanation from the homosexual community:
An excerpt from: In Their Own Words: The Homosexual Agenda:
"Homosexual activist Michelangelo Signorile, who writes periodically for The New York Times, summarizes the agenda in OUT magazine:
...to fight for same-sex marriage and its benefits and then, once granted, redefine the institution of marriage completely, to demand the right to marry not as a way of adhering to society's moral codes, but rather to debunk a myth and radically alter an archaic institution... The most subversive action lesbian and gay men can undertake --and one that would perhaps benefit all of society--is to transform the notion of family entirely." "Its the final tool with which to dismantle all sodomy statues, get education about homosexuality and AIDS into the public schools and in short to usher in a sea change in how society views and treats us."
The Homosexual Propaganda and Media Manipulation Game
What Homosexuals Say About Homosexuals - Is This Gay Behavior Sick?