Greater Male Variability Hypothesis
The greater male variability hypothesis, aka the variability hypothesis, states that males experience greater variability in sexual preference than females. The theory is also broadened to include variability in other traits. For example, the theory claims men have greater variability in general social attitudes, behaviours, intelligence, strength, other physical traits, genetic variation, etc... than women. The only exception being fear and emotionality, in which women show greater variability.
History of the hypothesis
The idea of men being more intra-sexually heterogenous than women in physical traits dates back to at least Charles Darwin, who stated his belief in such in The Descent of Man and Selection in Relation to Sex.
Sexologist Havelock Ellis famously expanded on this to include mental traits being more variable among men than women, in, "Man and Women: A study of human sexual characters" where he wrote
By the 1890’s several studies had been conducted to demonstrate that variability was indeed more characteristic of males...The biological evidence overwhelmingly favored males as the more variable sex.
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