Futopia

In the 1910s Futanari started being born. One tenth of all babies initially thought to be male turned out to be Futas instead.

A Futa is a woman who possesses both male and female genitalia. Adult Futas are generally taller and better endowed than men. The adult Futa height average is 6 feet, and their average erect penis size is 7.0 inches. Of course, small-dicked and petite Futas do exist, they're just very rare. Futas also produce a whole lot more semen than men, adult Futas needing to blow their load at least thrice daily or suffer severe pain in the balls.

A pregnancy from a man and a woman has a 50% chance to result in a girl, 40% in a man, and 10% in a Futa.

A pregnancy involving a Futa changes the odds to 70% female, 25% Futa, and 5% male. These 5% men also look much more feminine than regular men, are the same average height as women, have smaller penises, and are sterile.

What no one knew at this point was that Futa-Semen is a highly addictive substance for women. It tastes similar to regular semen, but stronger, bitterer and saltier. It also has a stronger smell. Once a woman has tasted it they cannot get enough. A single drop of sperm on her tongue and a woman is hooked for life. Even the smell of Futa-Semen works as an aphrodisiac.

Also, once a Futa turns 18, her cock and balls begin to emit a ridiculously strong pheromone affecting women. A woman in the vicinity of a fully-clothed Futa will start to find her attractive. Prolonged exposure leaves her personality intact, but compells her to act more submissive and demure around and towards the Futa. She will start constantly thinking of her, masturbating to her, and wanting nothing more than to please her. After a few days of exposure she will obey whatever command the Futa gives her, no matter how degrading or kinky. All that matters is pleasing her. They will also internalize whatever the Futa says about them. Being called brave will make her take more risks, being called stupid will lower her intelligence, being called a slut will make her desire sex constantly, etc. This also affects family members.

Women will also bond with the Futa whose pheromones made her reach the masturbation stage first, always prioritizing them over all other Futas. If she is not exposed to that Futa's pheromones for a whole year, the bond is broken and she can forge it again.

The process of pheromone indoctrination can be sped up massively by exposing a woman to a Futa's dick. Simply not wearing underwear, or wearing a skirt with underwear, nearly doubles the speed of the process. Being nude in front of a woman makes them reach the final stage in about 6 hours. Having her face in front of the dick finishes the process in less than an hour, and a blowjob, maximum two, make her reach the final stage immediately. Due to their need for constant jacking most adult Futas who did not wear skirts just never wore underwear in the first place, leading to the massive demographic shift that took place over the following decades.

1% of men are also affected by Futa-Semen and pheromones in the same way as women. Additionally, this is also true of all men who were concieved by a Futa .

1930s

The First Wave of Futas. Futas are well known to the public. Discrimination is high, but their pheromones lead to every single Futa fathering/mothering between 20 and 60 children in their lifetime.

1950s

Discrimination is much less widespread. Masses of women and some men unknowingly affected by the pheromones begin protesting for the rights of Futas, and the Futa Civil Rights movement takes hold.

1970s

The Golden Years. Futa Acceptance was at an all-time high and Futa's were a common sight.

1980s

The Discovery of the effects of Futa-Semen and their pheromones. The mind-addled state of women under the effect of the pheromones is officially called Futecstasy. New laws Futas to use men's toilets and discrimination flares up again. But there is a rising number of people who believe Futecstasy is a good thing. These are mostly women affected by Futecstasy, but their number is rising.

1990s

The Pushback. Pro-Futa and Pro-Futecstasy sentiment has taken over more than half the world's population. Being Anti-Futa is seen as sexist and regressive, and the ever-shrinking Anti-Futa population loses all their power. Both Futas, as well as men and women under the effect of Futecstasy, gain popularity in politics.

2000s

The Victory. By now, women are the majority and men the minority. A large number of men with Futa-Parentage have grown up , making the male population also affected by Futas larger than the unaffected male population. Affected men start dressing femininely and do voice training to feminize their voices in order to entice and allure Futas. These men are called Sissies. Almost all Anti-Futa sentiment has disappeared from public view. Pro-Futa politicians are in charge of almost all aspects of government. Laws begin to change.

2020s

The New Normal. Futas have replaced men as the dominant gender, whose numbers have shrunken drastically. Being a Sissie is normal for men, and being even prettier and more submissive than the girls becomes the societal expectation. All toilets are now unisex toilets and women's semen addiction has been normalized to the point where a woman asking to blow a Futa openly and drink their load is not only not shameful, but accepted as regular female behaviour.

2030s

Futa Supremacy. Laws are made that limit women and the few remaining men's freedoms. They are seen as too emotional, irrational and stupid to do most non-physical labour, and have to pass extremely difficult aptitude tests to even earn a position as a cashier. Men and women get seperate classes from Futas at school, teaching Futa-Supremacist propaganda, and they have to take much more difficult entrance exams to enroll in college. Due to Futecstasy, almost none of the oppressed mind their oppression. To adress female Futa-Semen addiction, bottled Futa-Sperm has started to be sold.

2050s

Futopia. All men are Sissies, and make up only 10% of the population. Men and women fill no positions of power, have no political representation, and they are okay with that. Men and women have become deeply competitive about Futa attention, and men have generally outpaced women when it comes to feminine behavior. As a result, male/female relations have reached an absolute historical low point and both sides deeply despise the other. Futas are expected to have at least three wives by the age of 25 lest they be seen as losers. Futas have basically taken control over every aspect of women's lives.

This is the basic timeline. A slightly more detailed version for each period is availabe in the relevant section.

(By the way, despite Sissies becoming more prevalent as time goes on, if you want to write a post-2000s story that doesn't involve them at all, you can do so. Sissies exist during these times, but if you want to write a story that focuses only on Futas and/or women, you are encouraged to do so.)