Futanari is a straight man's gay fetish. It's the result of how guys watch porn, just taken to an extreme.

Hyper-fixation on the female form; She is what looks good and that is what the viewer wants to look at, but his actual pleasure comes from his own penis.

The result is the conflation of the female form and penile pleasure, all of which tends towards autogynephilia and transsexuality. He projects his penis onto everything, "it makes it more relateable" (lol). https://twitter.com/EnzoEradicated/status/1243828592833777665

All of this can be done while the viewer is completely heterosexual (though it can be mutated into homosexuality given the right stimulus), the """transbian""" *retch* types are just autogynephilic men who have fully completed this process.

If you guys want to know more about this shit (you honestly shouldn't), google "a billion wicked thoughts" and "blanchard typology".

"A Billion Wicked Thoughts" was a study conducted by a few guys at Google that looked at porn consumption habits through web searches, they found some pretty interesting things.

a lecture given by one of the scientists:

Jordan Memerson talked a bit about it as well:

The fact that futanari is so popular a fetish shouldn't surprise anyone, it's just step 2 on the porn-brain descent into hell.