As your accusation against Luther - aside from the fantasy about lusting to marry and escaping in barrels to do so, and making that as evil as homo marriage - rests upon the premise that Rome is the supreme authority, then that remains the issue.
And which we reject, as we do men in Scripture itself who presumed authority above that which was written, and who were exposed by imperfect souls who set a precedent for valid dissent from such in conscience toward God, based upon Scriptural substantiation.
Obviously I cannot know about lusting or not lusting but they did escape in a barrel -- that is no fantasy. The evil is a bit less than homosexuality since heterosexual lust is a natural instinct. The arguments in defense of their fornication are, however, the same, because the crime is the same: people not free to marry attempt to "marry". And yes, Rome is the supreme authority for Christians on earth.