From nytimes.com. This article looks into the way that women respond to visual stimuli and how it supports the argument that their sexualities are generally more fluid than binary:

Dr. Chivers, a research fellow at the Center for Addiction and Mental Health at the University of Toronto, says she has data to support this assertion. She recently published results of a study in which she showed people video clips of naked men and women in various sexual and nonsexual situations and measured their genital arousal.

Heterosexual women, Dr. Chivers and her colleagues found, were no more excited by athletic naked men doing yoga or tossing stones into the ocean than they were by the control footage: long pans of the snowcapped Himalayas. When straight women viewed a video of a naked woman doing calisthenics, on the other hand, their blood flow increased significantly.

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