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.

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