There is a difference between bisexuality and bicuriousity.
I think you hit the nail on the head. It seems that only true bisexuals can realize this. Most, from what I have seen, are bisexual leaning toward either homo or hetero. Those of us who are truly bi don't have that leaning. As for bicurious people some retain this in adulthood, these people are predominately homo or hetero with the occasional craving for the opposite. As for arrousal, I feel that is a poor way to determine sexuality. A person can be arroused by pictures of one sex but not have any sexual attraction to that sex or to both.
There is no better love between 2 people than mutual respect for each other WT Young, 2002
Who gave anyone the authority to call me an authority on anything. WT Young, 1969
Since Evolution is only ~90% correct it should be thrown out and replaced by Creation which has even a lower % of correctness. W T Young, 2008