In brief
Amy Muise is a social psychologist, professor at York University, and director of the Sexual Health and Relationships Lab. Her research examines sexual desire, sexual satisfaction, relationship maintenance, sexual motivation, gender dynamics, division of labour, consensual nonmonogamy, intercultural relationships, long-term couples, and transitions such as becoming parents.
Muise matters to the Sensual Institute because she studies intimacy as it unfolds in ordinary life. Rather than relying only on one-time retrospective reports, her lab uses daily experience, dyadic, and longitudinal methods to examine what partners do, notice, want, and negotiate over time. Her work gives sensuality a relational context without turning relationships into a performance project.
Desire over time
Sexual desire often changes across a relationship. Early intensity may become less frequent, but a decline is not inevitable and does not mean that love has disappeared. Desire can be affected by stress, health, sleep, caregiving, conflict, novelty, privacy, medication, body image, and the meanings partners attach to sex.
Muise’s research asks which motivations, perceptions, and behaviours are associated with maintaining desire and satisfaction. This is different from promising a formula. A factor associated with desire in a study is not a rule that every couple must follow. Couples vary in culture, identity, relationship structure, resources, and what they consider satisfying.
A long-term intimate life may include periods of high desire, low desire, grief, repair, pregnancy, illness, parenthood, distance, and new forms of connection. Research is most useful when it helps people understand these shifts without turning normal variation into failure.
Sexual motivation and consent
Muise’s work distinguishes approach goals from avoidance goals. A person may initiate sexual activity because they want pleasure, closeness, play, or exploration. They may also do so to avoid disappointing a partner, prevent conflict, or secure reassurance. These motivations can have different consequences for satisfaction.
The distinction is ethically important. A partner’s pleasure can matter, and mutual generosity can be part of intimacy, but generosity is not the same as obligation. If a person says yes mainly because they fear anger, abandonment, punishment, or humiliation, the relationship needs attention beyond the frequency of sex.
Approach-oriented motivation should not be used as a new standard that pressures people to want sex for the “right” reasons. A person can consent while feeling ambivalent, or choose not to engage while loving a partner deeply. The point is to make motivations discussable, not to grade them.
Closeness and otherness
Muise’s research and theoretical work considers how closeness and distinctiveness may both matter for desire. Connection can support safety and attraction, while a sense that partners remain separate people can preserve curiosity, appreciation, and room for surprise.
Otherness does not require emotional distance or strategic withholding. It can mean having interests, friendships, perspectives, boundaries, and inner life that are not completely merged. Erotic attention may be supported when partners can encounter one another as familiar and still not fully known.
This idea should not be used to romanticise neglect, secrecy, or unequal power. A relationship can support autonomy through honesty and care. The goal is not to manufacture mystery but to leave space for two people to remain whole.
Conflict, labour, and gender dynamics
Couples negotiate more than sexual activity. They also negotiate household labour, caregiving, money, time, bodies, and whose work is visible. Unequal labour can affect desire and satisfaction because exhaustion and resentment enter the intimate field.
Muise’s research on gender attitudes and relationships examines how partners respond to gendered experiences and divide responsibilities. A conversation about desire may therefore need to include who plans, cleans, earns, remembers, initiates, and makes room for rest. Sexual advice that ignores these conditions can individualise a structural problem.
Gender is not the only axis. Race, class, disability, culture, sexual orientation, relationship agreements, and migration also shape the resources and pressures available to a couple. Good research asks who is represented and whether a result travels across contexts.
Methods that follow lived experience
Daily-diary and dyadic methods can show how experiences vary from one day to the next and how one partner’s experience relates to the other’s. Longitudinal studies can examine change across months or years. These methods reduce reliance on a single global memory, but they introduce their own burdens and sources of bias.
Repeated questions may change what participants notice. Couples who volunteer may be more comfortable discussing sex than couples in crisis. Attrition may remove participants with less time or less stability. Researchers must report these limits and protect intimate data.
Ecological validity also has limits. A daily survey captures some contexts, not the full texture of a sexual encounter. The best interpretation combines behavioural data with participants’ own meanings and with attention to consent, safety, and cultural context.
Diverse relationships and life transitions
Muise’s lab studies diverse relationships, including consensually nonmonogamous relationships, intercultural couples, couples coping with clinical sexual concerns, and people becoming parents. This breadth matters because relationship science has often treated one form of couple as the default.
Different structures require different agreements. In consensual nonmonogamy, honesty, negotiation, safer-sex practices, time, and emotional care are central. In intercultural relationships, partners may need to discuss family expectations, language, religion, and public visibility. New parenthood can reorganise time, sleep, bodies, and privacy. No model should assume that the same intervention fits all.
Human-capacity bridge
Muise’s work supports relational motivation, noticing what draws a person toward intimacy; desire patience, allowing change without panic; distinctive closeness, staying connected without erasing separateness; and shared negotiation, addressing sex alongside labour, time, power, and care.
For the Institute of Inner Technology, the bridge is the practice of remaining two people inside a shared life. Sensuality grows when closeness permits honesty and difference permits renewed attention.
What this changes
Amy Muise has brought rigorous social-psychological methods to the study of sexual desire, satisfaction, motivation, and relationship maintenance. Her work makes everyday couple dynamics visible without reducing intimacy to a checklist.
The lesson is that desire is relationally shaped but not relationally owed. Research can help partners understand conditions that support connection; consent and self-determination remain the foundation.
Related entries include Sexuality, Consent, Relational Presence, Boundaries, Agency, and Context.
Related entries
sexuality, consent, relational-presence, boundaries, agency, context.