-If you have sexual fantasies being with other women
-If you like being with women more than men (i mean, sexually AND socially)
-If you don't find men attractive
-If you get turned on by women
-If you find yourself (sexually) flirting with other women
-If you like women altogether (relationship-wise, sexually, everything)
-If you don't get turned on by men
-If you get turned on when women flirt with you
-If you find women attractive
If most of these are true for you, there's a good chance you are. If you find the same kind of things with men AND women, then you probably are bisexual.
Actually, even if there's a good number of these are true for you, you're probably somewhat bi.
PS Penguins!!!