The Klein Sexual Orientation Grid attempts to further measure sexual orientation by expanding upon the earlier Kinsey scale which categorizes sexual history from 0 (exclusively heterosexual) to 6 (exclusively homosexual). As a person travels on the scale, they are determined to be "Predominantly heterosexual, more than incidentally homosexual" at interval 2, "Predominantly homosexual, only incidentally heterosexual" at interval 5 and anywhere in between. At the centre, Interval 3 is "Equally Heterosexual and Homosexual".
|Variable||Past (entire life up until a year ago)||Present (last 12 months)||Ideal (what would you like?)|
|A - Sexual Attraction: To whom are you sexually attracted?||2||3||3|
|B - Sexual Behaviour: With whom have you actually had sex?||1||3||2|
|C - Sexual Fantasies: About whom are your sexual fantasies?||5||3||4|
|D - Emotional preference: Who do you feel more drawn to or close to emotionally?||2||3||3|
|E - Social preference: Which gender do you socialize with?||2||5||3|
|F - Lifestyle preference: In which community do you like to spend your time? In which do you feel most comfortable?||2||4||4|
|G - Self-identification: How do you label or identify yourself?||3||3||3|
Each of the 21 boxes should contain a value from 1 to 7, categorizing the individual's answers to the questions. For variables A to E these range from 1=Other sex only to 7=Same sex only. For variables F and G these range from 1=Heterosexual only to 7=Homosexual only.
Unlike the Kinsey Scale, the Klein grid investigates sexual orientation in three time periods and with respect to seven factors.
- Klein, Fritz, MD. The Bisexual Option, Second Edition. Binghamton, NY: The Haworth Press, 1993. ISBN 1-56023-033-9, ISBN 1-56023-033-5.