There's a qualitative difference between gay advocates and "adulterers".
Those of the "gay agenda" are not at all confused about their sexuality -- they've embraced it with arms and legs, and want the rest of us to do so, as well. Their expressed goal is to change church teachings on the topic of homosexuals and marriage.
Adultery, OTOH, will still (for now, anyway) have a moral stench to it, even if it is sometimes overlooked. It's still something to be hidden.
IMHO Paul's point in Romans 1 can't be separated from Romans 2: homosexual behavior is among a host of bad things, upon which it's God's job -- not ours -- to pass judgement. In the context of this discussion, I think Romans 1 offers instruction to the church about what it should or should not bless.
There is quite a difference between "judgement" and "discernment". It is our job to be fruit inspectors and to keep ourselves pure. It is also our job to name sin when we see it. (Ever heard of John the Baptist?) Also Christ and His disciples never seemed to stray away from naming sin when they saw it. Perhaps you could give your spin on the "Let your light shine" and "the salt of the world" speeches by Christ.
Saying that, I am fully aware that we are living in a world filled with sinners who are just fulfilling their job description. Many are overacheivers.