Typically, those who are bi-curious do eventually experience bisexuality. (Why choose? Why not have both? Be greedy...etc)
Bi-curiosity can also be a precursor to other sexual activities such as poly relationships, group sex (3-somes). (Like they say, curiosity killed the cat but satisfaction brought her back!)
Females seem to be more apt to admit bi-curiosity than males.
Girl, when another female tells you you're hot, she's gotta be at least, bi-curious!