You could love someone without it, surely. Is it just a legally binding document so that both parties trust each other more? Or some other legal reason? i.e before marriage the two of you probably buy stuff (from groceries to a house) for yourselves only but after marriage you buy stuff for him/her and vice versa you don't worry about it because if the marriage ends then the assets are split 50/50 or something? So marriage gives couples security in many ways. The other thing offcourse is that it formalizes the relationship and makes it more public which can make the relationship stronger. Also it becomes more troublesome to break it so can further prolongs the relationship and hopefully it dosen't end over some minor disagreement. Correct so far? What other purposes does it serve?