The Bible condemns homosexuality.

[Mystic]

There is a beautiful trust in men and women complimenting each other, and finding a balance in that nature. If free-will has a role, we ought to make sure, we make our state that which brings the most meaningful relationship out of the two, which is obviously between a man and a woman. 

Now if they were both just as good, the right thing to do would be to be Bi and relationships to be of that kind and family units to consist of those relationship.  However, the superiority of man to woman and over all monogamy, and it's beautiful relationship and meaning that comes out of it,  ought to be, that we all push each other towards that, and not just let a free- for all happen, where if someone wakes up in a certain state, does an action while a child, then society convinces him he is this and that, that is far worse, my friend.

Is making an inferior choice a moral evil though?

We have to push people towards a choice. Society has to come to terms on how we honor relationships if we do so at all. And I believe the best path is monogamy marriage between a man and a woman, unless, there is extreme circumstances (too many widows for example many orphans needing to be taken care of), it should be what society enjoins.

If we let it be whatever thinks they should do,  than, we are letting desires rule us, and that can have many consequences.

People can be living together 2 man and 2 women, or 3 men and 3 women or any combination, and we can call it "marriage" between all of them... 

Also, I would say the natural disposition is man and woman are attracted to each other, and if someone has alternate, they are being attacked by magic, and from my paradigm, they should be aware that is what is happening and society should not make it worse, by telling such a person, they are that way and there is nothing they can do about it.