I am really not agree with this relation. This is really a bull-shit. I think a couple of meeting is enough to know anybody it doesn't make any sense to live with him and be physical with him/her.
In each and every relation we have to adjust and sacrifice whether the relation of Dad-Son, Mom-Daughter, Sister-Sister, Brother-brother, brother-sister. If we want to live happily we have to understand and love and respect each others feeling thats it.
Husband-wife relation is so sophisticated relation as well as loving relation. If we say mother, father, brother sister relation is made by GOD then this relation is also made in heaven and we have to accept it and adjust with it. We should not over-ruled the principal made by god.