A world where all females would suddenly become able to function like some random kind of object for a while.
Their bodies would adapt as best it could without causing as many unnecessary physical chages as possible. And only the parts that were needed would change. So if a woman turned into a coat rack, then her arms and upper body would be stiff, but she could still move around with her legs and also speak. She just couldn't bend over, sit, or lay down unless she fell over.
The transformations begin once a girl becomes about 16 years old, and almost always are pleasurable. It is common knowledge that while trandformed, just about every women enjoys being used. If a woman is married, their partner, if they are a man, becomes their owner, and the women becomes his property where he decides who can and cannot use his wife.
Depending on what object, some woman require special designated areas to be created for them to use. Such examples are when a women becomes a fountain, or needs electricity to function. Most women will know when a change is about to happen about a half day in advance, but some unlucky women have no prior warnings whatsoever. Usually these women are provided a special facility to live in because of this.
All women will not suffer any downside while they become part object. They will not require food or water. Nor will they get tired or sore. And while it will not cure it, any illness will be postpone for the durration.
Jeff was happy with this, and went to activate it when 2 windows popped up. The first asked whether he wanted to remember this, or have his memory reset to the new world. He picked to keep his memories. The other window was much more interesting. It asked that since his change was gender defined, did he want to reshuffle the world's genders? Reading further into it, it said that it would maintain gender pairings, so a husband and wife would still remain 1 male and 1 female, but their genders could be swapped or kept the same. After giving it some thought, Jeff decided to let the system decide for him and picked random.
Finally, 1 last box appeared asking hin to define the scope of the change. Obviously, Jeff picked the entire world. Now that he was finished with all of the entry boxes, the Chronivac began the process. The moment Jeff clicked begin, he passed out.