Voted other. Adding sexual orientation as a protected class is an unfortunate need with consequences we have to come to terms with just as we did with race, religion, sex, age, disability, etc.
You would think with our society that we would not need such protections, if an organization did something that caused a public outcry the market response would be to no longer do business with that organization. "No blacks" allowed would get a hell of a response in most markets today, same with "no gays and lesbians served." As we have observed recently.
Our problem is one of history and reality. We have consistently over this nation's history designed one way or another to exclude for whatever reason and the reality is we do not have a market economy diverse enough so that those excluded have alternatives. The economic and social consequences were obvious then, and it should be obvious now why protected classes are an unfortunate need in our culture that has its own brand of social conservatism that stood against equality among races, equality among the sexes, etc.
In our history we have had the debate we are having right now over sexual orientation almost the exact same way they did then with race, or sex, or age protections, etc. We even characterize the reasons for being for or against protected classes the same way. Business freedoms really mean the freedom to be discriminatory, historically speaking when you get down to it. We have turned people away for work because of age saying the business model demanded so creating an unemployable bracket below social safety nets, we have told people of a certain race they are not welcome in local commerce using every excuse from religion to history causing economic disparity, and we see it today in the suggestion we should be able to hang up signs excluding based on sexual orientation because of religious ideology telling a demographic they are not included in local commerce.
It is all the same problem and it leads us to protected classes to handle a culture so intent to exclude. I do not like that we need protected classes, but I get why we most certainly are required to have them. Within the next 10 ('ish) years sexual orientation will be a protected class I suspect. That estimate has moved around a bit I'll admit but the reasoning holds.
What I've been saying for some time now is those today that stand for business discrimination on the grounds of sexual orientation will end up in the history books right next to segregationists of the 1950s. Social conservatism will eventually lose this fight, just as they did with race and just as they did with women. In some ways those demographics are still pushing against a society determined to discriminate one way or another. It is no different for sexual orientation, and for that reason it is difficult to see that gays and lesbians will lose their fight when so many other demographics held back by social conservatism won their fight.