Dr. Alfred Kinsey created a scale, graduated between heterosexuality and homosexuality, to rate individuals on actual experiences and psychological reactions. The ratings are as follows:
0 Entirely heterosexual.
1 Predominantly heterosexual, only incidentally homosexual.
2 Predominantly heterosexual, but with a distinct homosexual history.
3 Equally heterosexual and homosexual.
4 Predominantly homosexual, but with a distinct heterosexual history.
5 Predominantly homosexual, only incidentally heterosexual.
6 Entirely homosexual.
http://www.mindcaviar.com/bi/bitests.html
Some time ago I took the Klein Test, which is a more refined version of the test, giving you a result on the above scale.
See how you fare:
http://members.tde.com/ben/kleingrid.html
A quick and dirty test can be found here, however:
http://www.okcupid.com/tests/take?testid=12690194981799252510