[I]f you are a female author, you are much more likely to get the package that suggests the book is of a lower perceived quality. Because it’s “girly,” which is somehow inherently different and easier on the palate. A man and a woman can write books about the same subject matter, at the same level of quality, and that woman is simple more likely to get the soft-sell cover with the warm glow and the feeling of smooth jazz blowing off of it.

Interesting experiment regarding gendered book covers.