Pick a number, Any Number.
Sexuality isn't black and white. It can be fluid and change over time - or you can feel comfortable in one identity your whole life. Some are comfortable with labels, and others aren't. Most of us fall somewhere along a spectrum.
The Kinsey Scale is one way to look at the possibilities. It's a scale that ranges from 0 to 6, from "exclusively heterosexual" to "exclusively homosexual".
Dr. Alfred Kinsey and his colleagues developed "the heterosexual - homosexual rating scale" - The Kinsey Scale as you know it - in 1948.
There is no "official" Kinsey Scale test to show you exactly where you fit, though there are plenty of online quizzes. Where you fall depends on your personal history and knowledge of your own feelings. The Kinsey Scale clearly does not address all possible sexual identities (the "purple - red" scale of attraction is the latest way to map out the sexual spectrum), but it's still fun to think about.
The scale also is based on the assumption that you are only two valid genders. Yeah, it's not perfect.
Here's how the Kinsey Institute lays out the scale:
0|Exclusively heterosexual
1|Predominately heterosexual, only incidentally homosexual
2|Predominately heterosexual, but more than incidentally homosexual
3|Equally heterosexual and homosexual
4|Predominately homosexual, but more than incidentally heterosexual
5|Predominately homosexual, only incidentally heterosexual
6|Exclusively homonsexual
X|No socio-sexual contacts or reactions