Human judgment being so prone to err, it is well that the process of natural selection will tidy up with marriage. But, so far it hasn't tossed it, so marriage must then have survival selection value. A slow process, demanding effort by both partners. Paragraph 4 has a lot of truth in it. Even that is a sizable commitment, since one cannot force oneself to love another.
Nature needs our help.
As to the sex clubs, they are already here, but perhaps not so frenetic since the advent of some serious, and one fatal venereal disease. Our society has just begun to perceive this truth. Well, J.B., your letters never fail to start some hares, which I won't hunt down every one. Let them gambol over this Gromboolian Plain till Ellen Gilchrist picks them off. Some sage remarked that life is lived forward, but understood backward.