OMNICRON seems a little weirded out by this so ignore him
This is not really mathematics. I am not sure what category it fits in. But, it is an interesting question, so here is an opinion. ====> Simplified 3D Space
Sex ( D, P, L)
Where:
D: DNA of the person (+1 = Female, 0 = other, -1 = Male) Not being a biology major I am not sure 0 exists but I suppose it is possible
P: Physiology (+1 =Female, 0 = Hermaphrodite, - 1 = Male)
L: Libido ( -10 strongly attracted to Female, 0 Asexual, +10 Strongly attracted to Male. This is the only linear scale)
My understanding is that most bi-sexual persons tend to be more homosexual than heterosexual, so they would fit to the left or right of 0 in the Libido Scale
Biological male, Transsexual, Bi-sexual, prefers females
Sex( -1, +1, -3)
Biological Female, Physiological Frigid Female
Sex (+1, +1, 0)
"Normal" Heterosexual Male
Sex ( -1, -1, -8)
"Normal" m Heterosexual Female
Sex( +1, +1, +8)