If you marry an under-30 woman, the day will come, ostensibly, that she’ll be your over-30 wife. But you’ll have something that chagrined men who married women on the cusp of sagging cups don’t have: Years of very fond, very monopolized, very supple memories. If you maritally snag a 21-year-old minx and occupy her sugar walls for the next ten years, the spermatomically bonded cervix-splattered glue of all those splendid tumbles of passion accrue into something larger than the sum of your individuated speckles.It's as close to celebrating the benefits of monogamy as one should ever hope to get from the silver tongue. In its focus on carnality, however, it misses a piece of the marital equation that is of crucial importance to many men of this primate species with a rather unusual trait in the animal kingdom: Paternal investment. Like so many other behaviors that carry with them evolutionary benefits, the underlying biological drive is expressed a uniquely pleasurable part of a man's human experience. As cliched as it may sound, there really is no feeling in the world like rocking your son to sleep after he has collapsed into your lap.
Marry a woman in her thirties or forties, and there's a good chance the two of you won't have any kids together (even worse if she's bringing offspring from a previous relationship into the mix and you're not). As she wilts, sags, and tires over the years, well, that fat, flat shadow of her former self is all you're left with. Marry her in her teens or early twenties, though, and not only do you get to accrue all the benefits Heartiste discusses, but the two of you have ample time to create a brood together. The feelings you have for your children (assuming an average or high level of desire for paternal nurturing--this doesn't apply so much to men on the lower end of that spectrum) will splash all over her, too. She is the only person on the planet who has a stronger attachment to your children than you do. Your love for them will perpetually reinforce the attachment you have to her as the bond is weathered relentlessly by the passage of time and its nasty companion, senescence.