Shared adventures is the habit of deliberately doing new things together — a trip, a class, a tide-pool walk, a recipe neither of you can pronounce — so that exploring the world becomes a joint act and, later, a joint memory.
It is the practice of co-authoring novel experiences, where the operative words are novel and together. It is not ordinary quality time, which can be warm while staying entirely familiar; it is not a ritual of connection, whose power comes precisely from being repeated; and it is not one partner's hobby that the other tolerates. The flag is two people pointing themselves at the unfamiliar as collaborators, so the memory afterward belongs to the relationship itself. Scale barely matters — a free public lecture qualifies as much as a flight.
This is one of the better-supported green flags in close-relationships science. Arthur and Elaine Aron's self-expansion modelself-expansionThe idea that people are basically motivated to grow the self by adding new perspectives, skills, and identities, and that close relationships are a main…Glossary → holds that people are driven to grow the self, and that a partner is a rich source of that growth 1, a claim a recent four-decade review still rates among the most robust in the field 2. Crucially, the Arons' randomized experiments support a causal reading: couples assigned a novel, mildly arousing joint task showed greater gains in felt closeness than those given a mundane one, sometimes after only seven minutes 3. Later work found the boost runs not just through excitement but through felt securityfelt securityThe settled background sense that a partner is reliably there for you, so your nervous system no longer has to keep asking whether they are.Glossary → — doing something uncertain together generates evidence you can rely on each other 4. Daily-diary and longitudinallongitudinalA study that follows the same people over time (often years), allowing researchers to see change and sequence, not just a single-moment snapshot.Glossary → studies link self-expanding activity to more desire and satisfaction 56, while research on shared memory and "we" language shows adventures become the stories that sustain a couple's identity 78. The Gottman tradition frames this as creating shared meaning 9.
How to cultivate it
How to cultivate it. Prize novelty over expense 3, co-choose and co-plan so the memory has two authors, defend a small regular slot for it 3, aim for mild rather than terrifying uncertainty, and close the loop by telling the story afterward 7.
The honest caveat
The honest caveat. The strongest evidence concerns short-term boosts after a single activity 3, and the leap to "adventures will sustain a marriage for decades" is plausible but supported mostly by correlationalcorrelationalDescribing a link between two things without proving one causes the other — the pattern could run either direction, or both could share a third cause.Glossary →, self-reported data 56; people also differ enormously in how much novelty they want, so forcing the formula can backfire.