One proposal in Russian feminism movement in the beginning of XX century was "glass of water theory" (https://ru.wikipedia.org/wiki/Теория_стакана_воды , sadly there is no good English source) that stated that providing sex must be as easy as providing a glass of water to somebody who asks for one, and concepts of love/relationships/family/jealousy/cheating (which were viewed as related to interpretation of marriage as a sort of slavery) must be deprecated for this.
Other interesting proposal made by Eliezer Yudkowsky in the "Three Worlds Collide" novella was legalising rape.
One proposal in Russian feminism movement in the beginning of XX century was "glass of water theory" (https://ru.wikipedia.org/wiki/Теория_стакана_воды , sadly there is no good English source) that stated that providing sex must be as easy as providing a glass of water to somebody who asks for one, and concepts of love/relationships/family/jealousy/cheating (which were viewed as related to interpretation of marriage as a sort of slavery) must be deprecated for this.
Other interesting proposal made by Eliezer Yudkowsky in the "Three Worlds Collide" novella was legalising rape.