Every long relationship has a difference in desire. It would be remarkable if two people wanted the same amount of the same thing at the same times for decades. The difference isn’t the problem.
What causes damage is the dynamic that grows around it, and that dynamic is almost identical across couples.
The pursue-withdraw loop
The higher-desire partner initiates. The lower-desire partner declines. The higher-desire partner feels rejected, and the rejection accumulates into something about whether they’re wanted at all.
So they initiate more, or more anxiously. The lower-desire partner now experiences every touch as a potential opening bid, and begins avoiding contact entirely to avoid having to refuse.
Now there’s no affection either, which the higher-desire partner experiences as further evidence, and the lower-desire partner experiences as pressure that has expanded to fill the whole relationship.
Within a year neither of them is touching the other at all, and both feel unwanted. This is the mechanism, and it’s the actual problem rather than the frequency.
Why the framing matters
The default framing is that the lower-desire partner has a deficiency to be treated. Sex therapists generally reject this, for a straightforward reason: whichever partner wants less becomes the one who decides when it happens, so treating it as their problem to fix hands one person the responsibility for the whole thing.
It’s a difference between two people, and it belongs to both.
What actually helps
Understand which kind of desire is in play. If the lower-desire partner has responsive desire and both parties have been waiting for spontaneous wanting, the entire problem may be a misunderstanding about mechanism. This resolves a surprising number of cases and it costs one conversation.
Work on the brakes. Exhaustion, resentment, the mental load, feeling unattractive, the fear of being interrupted by a child. Removing these is frequently more effective than any attempt to increase interest.
Separate affection from initiation. The most important single change. Agreeing that touch isn’t a bid, explicitly and for a period, breaks the loop and allows both people to be near each other again.
Take the decision out of the moment. Many couples do better with some planning — which sounds unromantic and reliably works, because it removes the nightly refusal from the higher-desire partner and the nightly ambush from the lower.
Broaden what counts. A definition of sex that includes only one act guarantees more refusals than one that doesn’t.
What doesn’t help
Compliance. Sex that one person doesn’t want, done to avoid conflict, reliably lowers their desire further and frequently produces resentment in both directions —and a yes with no available no isn’t doing what anyone hopes.
Also: keeping score, ultimatums, and treating frequency as the measure of the relationship.
Where to take it
This is one of the clearest cases for couples work rather than individual work, because the loop is the problem and it lives between two people. There’s a directory for that at Online Relationship Counseling.
And if the lower-desire partner’s desire dropped suddenly, or came with fatigue or mood change, rule out the medical causes first.