>>40690714
Dopamine flatlines after orgasm. Dopamine is the reason porn addicts keep opening new images/videos rather than dwelling on the same one. Dopamine is all about anticipation and novelty. Every time you nut in your wife your dopamine response to her is lowered because novelty is reduced. Every time your wife has an orgasm with you her dopamine response to you is lowered for the same reason. That lowering of dopamine response is called habituation, and the logical conclusion to habituation is an unhappy marriage. It is nature's way of motivating you to seek new mates to spread your genes more widely.
What bonds people is oxytocin, that's what's released with hugs/kisses/cuddles and that's what causes most of the health benefits of sex. All the benefits and none of the drawbacks of sex can be had by avoiding orgasm. Of course, there needs to be a change of technique, shifting the focus from winding each other up to relaxation.