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The problem is that while it is obvious to you that sexual orientation is a matter of birth and not choice, it isn’t to, to be honest, the vast majority of people on this planet.
And also, just to put things in perspective, even the science isn’t fully convinced. Most evidence tells us it’s something from birth, and my personal life anecdote tells me I’m bisexual since the day I was born, but truthfully we don’t have any hard evidence to prove it, since it is nearly impossible to prove.
This is why it has to be included with the rest.
This, and not to mention the science changes.
The color of the skin might be something you are “born as”, but as Michael Jackson proved you can certainly change it. Does it mean it is a choice, and not “something that you are”? What happens once CRISPR becomes commonplace?