I believe there was a question earlier regarding "What is the Gay Agenda?" that hasn't really been answered yet.
So let's get to that now...
From "Conservapedia", here is what they claim the "conservative" view-point is...
Gay Agenda
The homosexual agenda, or homosexual ideology, consists of a set of beliefs and objectives. The ideology and goals, as explained further below, include restricting free speech, obtaining special treatment, distorting science, and interfering with freedom of association.
It is an agenda that gay rights activists set in the late 1980s, in a book called After the Ball, where they laid out a six-point plan for how they could transform the beliefs of ordinary Americans with regard to homosexual behavior — in a decade-long time frame:
"The agenda of homosexual activists is basically to change America from what they perceive as looking down on homosexual behavior, to the affirmation of and societal acceptance of homosexual behavior." [1]
Supreme Court Justice Antonin Scalia referred to the "so-called homosexual agenda" in Lawrence v. Texas, 539 U.S. 558 (2003) (dissenting opinion).
Focus on the Family quotes below from a leading book in the homosexual movement which outlines the points of the homosexual agenda:[2][3]
"Talk about gays and gayness as loudly and as often as possible."
"Portray gays as victims, not as aggressive challengers."
"Give homosexual protectors a just cause."
"Make gays look good."
"Make the victimizers look bad."
"Get funds from corporate America."
United States Supreme Court Justice Antonin Scalia wrote:
“ Today's opinion is the product of a Court, which is the product of a law-profession culture, that has largely signed on to the so-called homosexual agenda, by which I mean the agenda promoted by some homosexual activists directed at eliminating the moral opprobrium that has traditionally attached to homosexual conduct.[4]
The goals of the homosexual movement include: - censoring biblical condemnations of homosexuality and evidence that the "gay gene" is a hoax[5] [6]
- establishing affirmative action for homosexuals[7]
- expand hate crimes legislation to include sexual orientation[8]
- ending the military's and Boy Scout's restrictions on homosexuality[9]
- promote homosexuality in schools[10]
in places like Massachusetts and California — where the gay lobby is the strongest — it starts as early as pre-school. They tell seven- or eight-year-old boys — "If you only like boys, there's a chance you may be homosexual." Or — "If you only like girls, maybe you are lesbian." Well, at that age, all members of the opposite sex "have cooties."
You're planting a seed that can totally mess up the normal development process later, when at 12 or 14, kids enter the age of sexual confusion and discovering the opposite sex. [11]
- promote science that legitimizes homosexuality, such as claims of a never-identified gay gene[12]
- force businesses to accommodate their lifestyle
Suing an online dating website for discrimination [13]
- getting more rights in prison
Gay and Lesbian Prisoners in California Allowed Conjugal Visits [14]
Homosexual Agenda - Conservapedia
Oy vey!
You need hip boots to wade through that b.s.
Some of it glaringly inaccurate. Some of it taking isolated examples and proclaiming it as an "agenda" for all homosexuals. Some of it just as accurate for the "anti-gay" side of the fence, in their own mirrored way...
(Like the anti-gay organization propensity to themselves "Talk about gays and gayness as loudly and as often as possible."

)
(The point of posting this is not to side-track on the issues contained above, although I predict that inevitable attempt. The point is to demonstrate what people CLAIM/SAY when they talk about the "gay agenda".)
Getting back to the original point that the term "Gay Agenda" is used PROPAGANDICALLY, look at how they define it for proof!
Disclaimer: I use the word "'conservative' view-point" above with air quotes, mimicking the web-site's claims as to the basis of their explanation.
Personally, I find the definition to cater to the extreme right-wing anti-gay in its demeanor and phrasing. Most conservatives agree with gay equality on a long list of gay discrimination issues.
Obviously, not all...