In a nice commentary discussing the term and it's shallowness, Regis Nicoll notes:
How Mr. Sanders missed the memo is anyone’s guess, because marriage, which until quite recently didn’t need to be qualified as “traditional,” is a heterosexual institution by nature and definition. At the same time, marriage is, and always has been, for everyone regardless of sexual orientation.
That’s right: Any person, whether gay, lesbian, bisexual, or straight, can get legally married in any of the 50 states. Although common restrictions apply, concerning the ages, kinship, and genders of the interested parties, there is no restriction on sexual orientation.
Thus, contrary to the charges of “marriage equality” proponents, a homosexual is treated equally under the law to a heterosexual. Both are free to marry and both are subject to the same rules and conditions.
For instance, while a straight man is free to marry the woman of his dreams, he is prohibited from marrying his brother to become his insurance beneficiary, just as a homosexual is prohibited from marrying his or her same-sex partner for tax or insurance purposes.
In the interest of special interests
The fact that most homosexuals choose not to marry, under the restrictions that apply to everyone, doesn’t insinuate inequity for homosexuals. Their situation is like that of a social organization that wants to be treated as a church by the IRS but chooses not to conform to the definition of a church.
Indeed, the rejection of marriage as it has been known from time immemorial demonstrates that the agitations over “marriage equality” are not about equal access, for that already exists; it is about redefining the institution for special interests.
Imagine if, in the name of “tax equality,” Bill Gates were to propose that “nonprofit organization” be redefined so that he and Microsoft could enjoy the same tax benefits as Rick Warren and Saddleback. He would be rightly excoriated.
The same would happen to a white male wanting affirmative action benefits by redefining “ethnic minority,” or a civilian who would change designation of “military veteran” to gain VA benefits. But when a LGBT activist argues that marriage should be changed to serve the special interests of the homosexual community, he is upheld as a champion of civil rights.
While equality exists in marriage, and always has, it does not exist in “marriage equality,” particularly in the way differing opinions and those who hold them are treated.