In my experience living together is the start of tension between two people, regardless of gender or relationship status. Little differences between people's preferences start to boil over into major tensions. Also you get to see the not-so-flattering side of the other person, be that frumpiness, laziness, dirtiness or whatever, which often results in a loss of admiration and respect for the person.

Does this mean that moving in together spells doom for a relationship? And are we better off with a different take on living arrangements within a relationship? (like moving close to one another, but with a small distance between each other?) Or is the red pill advice the best, where you only move in together when getting married/starting a family and the honeymoon phase is over?