In the study, eye-tracking devices found videos of both naked men and women caused straight women's pupils to dilate, signalling sexual arousal, www.medicaldaily.com reported.
"Even though the majority of women identify as straight, our research clearly demonstrates that when it comes to what turns them on, they are either bisexual or gay, but never straight," led researcher Gerulf Rieger from the University of Essex, England, was quoted as saying.
The findings also demonstrated lesbians were sexually aroused by girly porn more so than the male material. Their responses from the female sexual stimuli were comparable to the responses of straight men.
A 2011 study from Boise State University found 60 percent of heterosexual women admitted to being attracted to other women, while 45 percent had kissed another woman.
Fifty percent of those participants also reported same-sex sexual fantasies.
The findings showed that straight women, not just lesbians, ogle at beautiful women.
For straight women, these sexual fantasies and feelings of intimacy and romance with another woman may be projected onto their porn viewing habits.
The study appeared in the Journal of Personality and Social Psychology.
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