Here are several questions that have been hotly contested at YVCC, and the debate (more like argument!) was split into many factions, with none willing to accept the other's arguments! So, for your benefit, here are the questions that I posed several years ago to that crowd, plus several debate topics:
It is my personal belief that all humans are bisexual, only to varying degrees: if anyone were to examine their true thoughts on the matter, unmired by personal beliefs and cultural influences (which of course is impossible), I think that everyone would find at least some purely sexual interest in both people of their sex and also in those of the opposite sex. Imagine a line, with arbitrary ends, say, homosexuality on the left and heterosexuality at the right, vis:
Homosexuality_____________________________Bisexuality____________________________Heterosexuality
If my views hold, then most people could place themselves somewhere on this line but not all the way towards one end or the other.
Is this a good model? Why?
What about morality? Who would accept this model? Why?
If more people believed this, how would it change the typical American view of homosexuality and bisexuality?
Could intolerance in this country cease?
Are there any other ideas or models?

I don't agree with the assumptions that uphold your model.
Like race, heterosexuality and homosexuality are social constructs, you have assumed they can function as objective and material categories, even though you happen to reject that any person could fit either of them 100 percent.
And once more, although modern genetics has shown that "white" and "black" are not exclusive categories and they blend to such a degree that it eliminates and objective differentiation between them, racism still persists.
As social constructs, these categories give groups power. Look at race historically: one group might be perceived as less "white" than another, but even the "less white" group will still use their relative whiteness against those who are less "white" than they. This is probably best personified in American History by Nordics vs. Irish vs. African Ameircans. Thus, even if Americans were to accept this notion, sexuality would still function as an axis of power.
And like race, because these are simple social constructs, asking whether they can blend doesn't seem to be asking much, because its really up to you. As a result, it makes no material difference in the world we live in where one sets the parameters of these constructs.