Jeff had a fantasy that he had always wished would have been possible. It was a monthly festival where the entire focus was around having sex. Participation would be voluntary too. But the big kicker was that every month, instead of a normal period, all females of legal age would find that their bodies would become very moldable, kind of as if they all had turned into clay, instead. And while like this, their entire physical form could be reconstructed into any shape, both pain and risk free.
And whenever a woman was reshaped, she would adapt to her new form's limits. So for example, if a woman were to remove her face, she wouldn't be able to see, smell, or taste anymore. She would not be able to hear if her ears also were removed. But at the same time, she also wouldn't need to eat, drink, or breath either. So if she were to give herself a long tentacles with a mouth on the end of it. Then she could speak, breath, eat, and taste with that new mouth, plus she could control her new appendage however she believes she should be able to.
Another interesting feature would be that all women durring this time are virtually invulnerable and cannot die by being physically harmed. Sure if they were to be suffocated, or exposed to the extremes of temperatures, then they still could perish, but being shattered, cut, or pulled apart wouldn't do anything to them besides be an annoying inconvenience. And this was thanks to the fact that all woman would return back to a normal human form, safe and unharmed, at the end of the festival.
With this festival, it would tradition for the participating women to put themselves on display after reshaping themselves. The only requirement would be fore them to always have an easy to access orifice to fuck. It can be any or all of their holes, but at least one, traditional sex hole (either their mouth, ass, or pussy) is required.
Women would take on all kinds of forms, from different kinds of statuary, to animalistic ones, and even inanimate objects were popular. It would be a general understanding that just becomming an enhanced version of yourself, or especially reshaping into someone else, is pretty frowned upon. So no one ever does that. Plus it is meant to be more for fun and as a unique form of self expression.
There are a few rules Jeff had in mind for the men as well. Every man who participates must be STD/I free, have no current health/legal concerns, and must be of legal age. Also, in order to keep things peaceful. Any fighting, or damaging of the woman will be an immediate ban from the festival. Doing things not permitted by the woman you are looking to fuck (such as pissing on to/inside of them if they don't want you to) will also result in a permanent ban and potentially even legal issues depending on the circumstances.
And finally, unlike how it is now. All women will have their periods sync up. And if they moved out of the area, they would go back to having normal periods again. The area for this festival would only just be his hometown.
So with this idea in mind, Jeff proceeded to enter it into the chronivac as best he could. And as a last moment idea, he shuffled everyone's gender, though any parents would always have at least one female among them. And with that, Jeff puts his idea into motion and makes the change.