Then you should be in favor of passing a law to make it illegal for everyone to display pictures of either their "partner" or their wife and kids on their desk at the workplace, for example. Both are a declaration of one's sexual "orientation".
And why would this follow? Are you saying that a marriage between a man and a woman is equivalent to a man and a man (one pretending to be a woman, I guess) or a woman to a woman (one pretending to be a man, I guess)? Oh please. What a stretch. What a reach. Homosexuals would not even exist if a he or she did not have PARENTS....one egg, one sperm and all that.
But so what if a guy puts a picture of another guy on his desk....it could be a friend. And if he doesn't want any questions because this is his 'sex' buddy, then he probably should not advertise that fact. Putting a marriage photo on a desk at work, putting pics of children on a desk at work is not a declaration of SEXUAL PROCLIVITY, it is a declaration of family. You know....man, woman and children.