It is therefore possible for a civilized man and woman to be happy in marriage, although if this is to be the case a number of conditions must be fulfilled. There must be a feeling of complete equality on both sides; there must be no interference with mutual freedom ; there must be the most complete physical and mental intimacy; and there must be a certain similarity in regard to standards of values. (It is fatal, for example, if one values only money while the other values only good work.) Given all these conditions, I believe marriage to be the best and most important relation that can exist between two human beings.
Source: Bertrand Russell :Marriage and Morals, 1929
More info.: https://russell-j.com/beginner//MM10-120.HTM