Well said. You elaborated it in a way I couldn't put into words. The single line scale is insufficient and misleading. I'm not gonna say attraction is fluid as that implies an overall transience and impermanence to one's sexual orientation which I don't think is true, but there is some ebb and flow over time around a basepoint.

Second, the degree of attraction can fluctuate-- one may feel more attracted to women at one time, more to men at another (and somewhere in-between at still others). For many bisexuals, this is a dynamic, even complex, thing.

Yeah, and said in that way, attraction can also be seen as a relative thing. The Kinsey single scale shows attraction for one sex decreasing as it goes up for the other. But does it really work that way? This is a very "zero sum" model. Like sand in an hourglass.

Basically, then, my objection comes down to this model being based on MONOsexual assumptions-- the fact that it just isn't BISEXUAL enough. A single line makes sense from the gay or straight perspective; they have only one sex to measure attraction to. We don't. I think that bisexuals need a pair of scales. Separate, but perhaps intersecting at certain points. Or something like that. Otherwise... you just aren't really getting us.

Yes, exactly. A pair of scales(Meters?). Female and Male attraction. And when one goes up or down in degree, the other may or may not necessarily move at all. But there is still relative movement as long as one changes. One attraction may become dominant over the other over time. And this would be unique to Bisexuals.

The Monosexual model can either be a same sex or opposite sex single attraction scale. The level/degree of which can fluctuate like a Bisexual's would, except the movement is not half as noticeable because there is no juxtaposition. In other words, A gay male, lesbian, or straight male/female will have natural ebbs and flows in attraction to a single sex, but these go relatively unnoticed because they don't have attractions to a second sex to compare it too.

Anyway, it's clearly a very rough idea for an alternate model but it's helpful in that it negates both the "Everyone's Bisexual" or "Sexuality is fluid and changeable" concepts which monosexuals have to deal with. The tldr of the model goes like this:

1. Heterosexuals get a opposite sex attraction scale.
2. Homosexuals get a same sex attraction scale.
3. Bisexuals get same and opposite sex attraction scales.
4. The level in each scale can change over time. Perhaps independent of each other when it comes to Bi?.

Now, this is currently overly simplistic and probably only really useful as a potential visualization exercise for bisexuals and those who want to understand the difference between sexual orientations. But I think it may become useful in a way that the Kinsey scale isn't.

Edit: Also, Aces. The Kinsey Scale does not account for Asexuals. But maybe this model with it's 'degrees of attraction' can.