Direct answer: Research suggests that long-term desire depends less on a fixed trait and more on how two partners respond to each other, especially when one of them says no.
Many people assume that desire simply fades with time, or that it belongs to one person alone. The studies below tell a more useful story, and it matters when you are choosing someone to build a life with.
We use only peer-reviewed work indexed in PubMed, and we say plainly where the evidence is thin.
Desire is also personal, so none of this is a verdict on any single relationship. Think of it as a lens for noticing patterns early, before you promise a lifetime to someone.
Does long-term desire rise and fall over the years?
A systematic review in the Journal of Sex Research examined 64 articles on how desire is maintained in non-clinical, long-term relationships. Its authors sorted the findings into three levels: individual, interpersonal and societal.
The review notes that desire ebbs and flows, both within one person and between partners. It also notes that desire problems are strongly linked to relationship problems.
There is an honest limit here. The authors state that we still understand too little about what keeps desire going inside relationships, and they describe clear gaps in the existing research.
Why does desire depend on the pair, not only the person?
Most theories treat sexual desire as something that lives inside one individual. A newer conceptual model, called DIADICS, argues that desire for a partner also grows out of what happens between the two of them.
The authors describe three parts of those interactions: their structure, their content and the process through which they shape desire. They then use the model to explain why desire fluctuates in long-term relationships.
This is a theoretical framework, not a tested prediction. It gives us a useful way to think, but it does not prove that any single habit will rescue desire.
In plain terms, a partner’s words, tone and timing become part of the setting in which your desire either opens up or closes down. This is our plain-language reading of the model, not a measured result.
How should a partner respond when you say no?
A recent paper in the Journal of Sex Research tested exactly this question in three studies. One was a cross-sectional survey of 315 individuals in relationships.
The other two followed couples with daily diaries. Together they covered 219 couples and more than nine thousand daily reports.
Hostile rejection, for example criticism, was linked to resentment in the rejected partner. Reassuring rejection, such as expressing warmth or interest in sex in the future, was linked to understanding.
Reassuring rejection also went with maintained sexual desire in the partner who was turned down. The authors present this as a set of observable behaviours that researchers and clinicians can use.
Notice what reassurance does not mean. It does not mean agreeing to sex you do not want. It means the refusal arrives with kindness, so the relationship stays safe even when the answer is no.
These are associations drawn from self-reports. They show a pattern, but they cannot prove that warmth alone protects desire.
Do everyday warm responses protect desire too?
A daily-diary study followed 240 couples in the months after a birth, looking at how partners respond when one shares a positive parenting moment. Diaries ran for 21 days, starting three to four months after delivery.
On days when partners perceived warmer, more engaged responses than usual, they reported higher sexual desire and higher relationship satisfaction. The sample was new parents, so the pattern may not apply to every couple.
Still, it points in the same direction as the other studies. Warm, engaged responses and desire seem to travel together, at least in this sample.
What does this mean for choosing a life partner?
You cannot test desire in advance, but you can watch how someone responds. How a person handles disappointment, disagreement and a gentle no shows a lot about the climate they will create at home.
While dating, watch for these signs:
- Does your partner stay warm when you decline something, or turn critical?
- After a disagreement, do they show that they still want closeness?
- When you share good news, do they respond with real interest?
- Can you talk about desire without it becoming a verdict on you?
Before committing, have one calm conversation about how each of you would like to be turned down, and how to return to closeness afterwards. It costs nothing and tells you a great deal.
Culture and family background shape how people express refusal, so give a partner time to explain their style before judging it. What matters is whether warmth survives the disagreement.
There are two common mistakes. The first is treating low desire as proof that love is gone. The second is expecting desire to stay unchanged without any attention from either side.
The research here is mostly observational and based on self-report. It supports attention to how partners respond, not a formula for guaranteed desire.
Frequently asked questions
Is it normal for desire to fall in a long relationship?
Yes. According to the 64-article review, desire ebbs and flows within and between people. A change alone is not a sign that the relationship has failed.
What is a reassuring way to say no?
In the studies, reassurance meant expressing warmth or interest in sex in the future, instead of criticism.
Does a warm partner guarantee lasting desire?
No. The studies show associations, and desire also depends on individual and societal factors.
Can I judge this before marriage?
Partly. Watching how someone responds to a no and to good news is a reasonable guide, not a proof.
Scientific sources
- Mark KP, Lasslo JA. Maintaining Sexual Desire in Long-Term Relationships: A Systematic Review and Conceptual Model. J Sex Res. 2018;55(4-5):563-581. PMID: 29521522 · DOI: 10.1080/00224499.2018.1437592
- Prekatsounaki S, Gijs L, Enzlin P. Dyadic Sexual Desire in Romantic Relationships: The Dyadic Interactions Affecting Dyadic Sexual Desire Model. Arch Sex Behav. 2022;51(1):417-440. PMID: 35031906 · DOI: 10.1007/s10508-021-02165-8
- Dobson K, Kim J, Muise A, Harasymchuk C, Impett EA. Buffering the Sting of Sexual Rejection to Promote Relationship Connection. J Sex Res. 2025;63(8):1482-1494. PMID: 41348462 · DOI: 10.1080/00224499.2025.2590034
- Tavares IM, Dawson SJ, Rosen NO. Capitalization responses to daily parenting events: Associations with couples’ postpartum sexual and relational well-being. J Fam Psychol. 2025;39(7):917-928. PMID: 40788696 · DOI: 10.1037/fam0001395
This article is also available in Persian: میل جنسی در رابطه بلندمدت؛ چه چیزی آن را حفظ میکند؟
