Futanari came about due to people's fascination with shemales. Other say it's just an extra form of Yuri where the newly added part of the women is just imitating a strap on. Mostly Futanari takes place with the Futanari character and another woman, although scenes with multiple women and men do happen too. It's typically shown as the women having both male and female parts. And then sometimes it shows the women having a giant clit and no balls.
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