"The strongly favoured androcentric theory is that the difference [between men and women] is an aesthetic improvement, and that it evolved as some sort of sexual stimulus.
This is essentially a circular argument. 'I find this attribute sexy: therefore it must have evolved in order that I might find it sexy.' It's like saying that a wman walks with a wiggle because this is attractive to a male. In fact, she only walks with a wiggle because her children are so intelligent. The necessity of passing a large-skulled infant's head through her pelvic ring has prevented her skeleton to adapting to bipedalism quite as gracefully as her brothers; and males only find this defect attractive because they associate it with femininity."
-Elaine Morgan, [The Descent of Woman]