A third concern with the Kinsey scale is that it inappropriately measures heterosexuality and
homosexuality on the same scale, making one a tradeoff of the other.[87] Research in the 1970s on
masculinity and femininity found that concepts of masculinity and femininity are more appropriately
measured as independent concepts on a separate scale rather than as a single continuum, with
each end representing opposite extremes.[88] When compared on the same scale, they act as
tradeoffs such, whereby to be more feminine one had to be less masculine and vice versa. However,
if they are considered as separate dimensions one can be simultaneously very masculine and very
feminine. Similarly, considering heterosexuality and homosexuality on separate scales would allow
one to be both very heterosexual and very homosexual or not very much of either. When they are
measured independently, the degree of heterosexual and homosexual can be independently
determined, rather than the balance between heterosexual and homosexual as determined using the
Kinsey Scale.[89]
Klein Sexual Orientation Grid[edit]
Main article: Klein Sexual Orientation Grid
In response to the criticism of the Kinsey scale only measuring two dimensions of sexual
orientation, Fritz Klein developed the Klein sexual orientation grid (KSOG), a multidimensional scale
for describing sexual orientation. Introduced in Klein's book The Bisexual Option (1978), the KSOG
uses a 7-point scale to assess seven different dimensions of sexuality at three different points in an
individual's life: past (from early adolescence up to one year ago), present (within the last 12
months), and ideal (what the individual would choose if it were completely their choice).
The Sell Assessment of Sexual Orientation[edit]
The Sell Assessment of Sexual Orientation (SASO) was developed to address the major concerns
with the Kinsey Scale and Klein Sexual Orientation Grid and as such, measures sexual orientation
on a continuum, considers various dimensions of sexual orientation, and considers homosexuality
and heterosexuality separately. Rather than providing a final solution to the question of how to best
measure sexual orientation, the SASO is meant to provoke discussion and debate about
measurements of sexual orientation.[87]