Under your axioms, it may be equivalent, but I think they're mistaken.

Orientation is not a choice, and is orthogonal to identification.

I believe that same-sex relationships can be as profoundly fulfilling, enriching, and pro-social as heterosexual relationships.

That marrying a straight woman with a gay man is profoundly unfulfilling for both.

And that denying a class of people something so profound, freely enjoyed by everyone else, and which does not harm anyone else, can indeed be seen as inhumane.

You say orientation isn't a choice even though bisexuals at least establish it as their free choice for relationship. Fine. Even if you correctly claim that some people may have an immutable orientation, why would you in your brilliant and far reaching wisdom think it would be inhumane for the same person to be celibate from that orientation? And further think it is inhumane for the person to engage in a relationship of another orientation?

I don't believe for a second any person has this immutable orientation, straight or gay. And likewise, I don't believe it is inhumane for a person to avoid a relationship that is illegitimate. Trying to argue otherwise is like arguing the color blue can also be seen as red.

I am not bisexual, but tried to be. The choice wasn't available.

Have you felt strong attraction for both sexes? If not, have you tried to?

If you tried to feel attraction but could not, you might need help on understanding what attraction is. Until you do, you won't know what love and harm is.

You feel attraction for both sexes, but choose to ignore one?

You choose to behave.

We are here. We do not harm each other. We do not harm other people. I believe God wills it. Peace, Nas.