Over at The Volokh Conspiracy, Eugene Volokh writes, "the big picture is both the left and the right [are] calling for some speech restrictions, and opposing other speech restrictions." Examples over time include this from anti-gay neo-con Irving Kristol (from the summer of, appropriately enough, 1984): "I don't think the advocacy of homosexuality really falls under the First Amendment any more than the advocacy or publication of pornography does."
Volokh adds, "The advent of the left-wing feminist calls for restricting sexually explicit speech in the 1980s has evened the matter somewhat," and then tallies support for censorship ranging from politically correct speech codes (the left) to anti-flag burning efforts (the right).
Speaking (while we can) of loony rightwing speech, Maggie Gallagher's Institute for Marriage and Public Policy reposts an article from the religiously right journal First Things by Ryan T. Anderson, who opines:
Living a chaste life on a college campus is difficult. Defending your commitments to chastity, whether to your friends in the dorm room or to your professors in the classroom, is even more difficult. If you haven't been a university student for a while, think back to what the sexual climate on campus was like when you were in college. Now imagine what it's like with official university LGBT offices pushing for same-sex marriage and gay rights. ...
Think about that: Advocating the mutual commitments and responsibilities of same-sex marriage makes it more difficult for heterosexuals to remain chaste, somehow.
I suppose the thinking might be that fiddling with sexual barriers of any kind regarding homosex will open the floodgates (the Rick Santorum view), or that some LGBT activists actually do advocate the elimination of marriage and related behavioral norms as oppressive and patriarchal (thanks again, guys and gals).
But still, you have to gasp at the gall behind the assertion that exposure to the mere advocacy of gay marriage will tempt innocent straight co-eds to go, as it were, straight to hell.