Being gay is a fetish.

[John V]

But, if someone in the middle part of the bi spectrum chooses to self identify as gay, you consider them gay, rather than bi. That's a choice, and blacks don't have that choice.

But again, I think you're conflating two different choices here; a bi person choosing their label is not choosing who they are attracted to, that is still something beyond their control. Regardless of what label they opt to adopt, what they are attracted to is not a conscious choice (for example, I can't make the choice to be more attracted to men, or to alter what it is about people that I find attractive, even though I am attracted to all sexes) and they are no more in control of that aspects of themselves than, as you say, black people and their skin color.
When the entire argument being referenced here is that homosexuality cannot be immoral because nobody has control over being gay, that's a non-trivial distinction. Bisexual people might have some latitude regarding labeling and choice of partner, but they're still stuck where they are on the spectrum.

With rexbecca I was speaking of a bi continuum. You're speaking of gay and bi as is they're distinct qualities, rather than different points on a continuum. My comments to rexbecca aren't intended for someone with your view. 

ETA: Also, are you a determinist in general?