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Sexual orientation is a vast topic that only seems to get more and more complex and wide with the passing of each generation. So far the LGBTQ+ community embraces anything from 15 to 27 different kinds of gender and sexual orientation, from the already known homosexual, bisexual, heterosexual and transexual to sapiosexual, demisexual, graysexual, pomosexual, etc, etc, etc.
From my point of view, the more we categorize ourselves and each other, the further we create divisions. And perhaps this new scientific theory, published in the journal Biological Reviews, has an answer to all of these questions. When it comes to women, none of us is really 100% straight. According to the theory, which was formed by evolutionary psychologist Satoshi Kanazawa, most women are evolutionarily designed to be "sexually fluid" or switch up whether they're into men, women, or both in the course of our lives.
This is different for men; men tend to have their sexual lines and borders biologically and psychologically quite clearly defined and are, as far as science has studied, unable to switch from one preference to another. However for women this shows to be completely opposite. One theory tries to explain this by saying that it could all be a consequence of the polygamous marriages that occurred in societies long, long ago. Women were almost forced to change their sexual desires and identities over time from lesbian to bisexual to heterosexual and back again in order to keep the peace with their co-wives.
"Rather than being straight or gay, to whom women are sexually attracted may depend largely on the particular partner, their reproductive status, and other circumstances,” Kanazawa says. So basically, according to his theory, us women just go with the sexual flow and are attracted to whatever feels right, unable to be entirely straight, entirely gay, or 100% bisexual.