Mismatched desire predicts a marriage better than low desire does
The number that sinks long relationships usually isn't how much sex either partner wants.
Sex therapists spend a surprising amount of time correcting a simple mix-up: couples arrive worried about frequency, when the research keeps pointing somewhere else. What predicts relationship satisfaction most reliably isn't how often a couple has sex, or even how much either partner individually wants it. It's the gap between what each partner wants — desire discrepancy, in the literature's flat phrase for a very unflat problem.
A couple who each want sex twice a month can be entirely content. A couple where one wants it daily and the other weekly can be quietly miserable, even though both numbers, considered alone, sound reasonable. The distress lives in the distance between the two people, not in either person's individual appetite, which is why comparing your relationship's frequency to some national average solves nothing.
There's a further complication worth knowing before it curdles into shame: for women specifically, research has found that having somewhat higher desire than one's partner is associated with fewer relationship adjustment problems, not more — the opposite of the cultural script where wanting more makes you the demanding one. Desire, it turns out, is one of the few places where the raw number matters less than everyone assumes, and the difference between two people's numbers matters more than anyone wants to say out loud at dinner.