Sixteen findings from relationship science worth knowing. Each has enough research behind it that you can trust it to describe your relationship more accurately than most folk-psychology substitutes.

1. Looking at a partner's photo activates the brain's reward system

The same regions that light up in early-stage addiction. Romantic love is neurochemically distinct from other social attachments.

2. Long-term love looks different from early-stage love

In long relationships, the early dopamine-heavy "passion" signature gives way to oxytocin-heavy bonding. Different system, not a decline.

3. Couples with more physical contact have higher satisfaction

Non-sexual touch — hand-holding, hugs, casual affection — predicts relationship quality independently of sexual activity.

4. People choose partners similar in attractiveness, not opposite

The "matching hypothesis." Opposites-attract is mostly a myth; similarity across multiple dimensions is the stronger pattern.

5. Attachment style predicts partner choice

Anxious and avoidant styles often pair together — the mismatch feels familiar, even when it's painful.

6. Stress kills sex drive reliably

Chronic stress affects hormones, sleep, and emotional bandwidth. Couples who report low sex often have high stress they haven't addressed.

7. Gratitude expressed verbally predicts relationship longevity

Daily, specific gratitude — "thank you for handling bedtime" — correlates more strongly with relationship durability than grand gestures.

8. Couples who fight well do better than couples who don't fight

Conflict avoidance is worse than skilled conflict. The repair pattern matters more than the frequency.

9. Sharing novel experiences increases satisfaction

Novelty activates reward pathways similar to early-love. Couples who try new things together stay more connected.

10. Secure attachment can be learned

Adult attachment style isn't fixed. Relationships with securely- attached partners — or therapy — can shift insecure styles toward secure over months to years.

11. Humour shared during conflict predicts marriage success

Gottman: if couples can laugh together in mid-argument, they're more likely to stay together. Not hostile humour — shared amusement.

12. Long-distance relationships aren't doomed

Meta-analyses show LDRs have similar satisfaction to geographically- close relationships during the separation — but face increased strain on reunion.

13. "We-talk" predicts relationship health

Couples who naturally use "we" language in daily speech — "we're trying a new restaurant" versus "he wants to try a restaurant" — show higher relationship quality.

14. Small bids for attention matter more than big gestures

Gottman again: how partners respond to everyday bids (a comment, a look) predicts long-term satisfaction more than anniversary gestures.

15. Sexual frequency declines naturally over time

The drop is normal and not a sign of relationship failure. Quality, communication, and intimacy don't have to decline with frequency.

16. The strongest predictor of a happy marriage is a happy wife

Multiple studies converge here, in heterosexual marriages specifically. Investing in her satisfaction consistently predicts both partners' reported happiness.

Sixteen facts. Knowing them won't fix a relationship, but it makes diagnosing what's happening radically easier. And diagnosis is usually where the hardest relationship problems actually get stuck.