Double family

Through human history there is a line of idea of common life in a community or a bigger society and character is determined by solving sexuality. In kibuc and ashram sexuality is almost taboo while in other groups it can be a part of common rituals. I do not give up ideas of community, but I think that there is no space for personal partner relationship, a man is almost alone here.
Idea of double family as a form of coexistence of two couples is a compromise between independent life of married couple and community. A model of double family should connect advantages of common life with advantages of intimate environment and privacy of partners. Of course I presume that all adults that take part in that coexistence are confessors of Natural faith. Coexistence of persons belonging to different cults is very problematic because they create mutual blocks. Coexistence of persons must be without blocks and in opinion agreement.
Coexistence in double family solves a problem of falsehood if each man and each woman has two partners of opposite sex. It can also prevent sexual diseases. In coexistence of four persons it is possible that one woman stays at home and takes care of children. If there is unemployment than the unemployed stays at home and the others support him. And if all of them are unemployed it is sure that they could get by on more easily.
There is a lot of advantages of this coexistence for example mutual solidarity, easier realization of personal interests and so on but it is not examined relationship and the problem can be in possibility of enforcing own will and limitation of privacy.