Chapter 23: The Science of Attraction — What Actually Predicts Who You'll Like

Pop psychology has strong opinions about attraction. Opposites attract. There are 36 questions that can make you fall in love. Body language "hacks" can make anyone attracted to you. Evolutionary psychology explains mate preferences as hardwired adaptations. Pheromones signal compatible immune systems. Your attachment style determines who you're drawn to.

Most of these claims are wrong, oversimplified, or far more complicated than the dating advice industry wants you to believe. But some of the research on attraction is genuine, well-replicated, and fascinating — it just doesn't make for good listicles.

This chapter fact-checks the most popular claims about what predicts attraction and what makes people like each other, separating the well-supported from the oversimplified and the debunked.

Before You Read: Confidence Check

Rate your confidence (1–10) that each statement is true.

1. "Opposites attract — people are drawn to those who are different from them." ___
2. "The 36 questions can make you fall in love with anyone." ___
3. "Physical attractiveness is the most important factor in attraction." ___
4. "Evolutionary psychology has identified universal, hardwired mate preferences." ___
5. "Body language hacks can reliably increase your attractiveness." ___

Opposites Attract: The Myth That Won't Die

The Pop Claim

"Opposites attract" is one of the most enduring beliefs about relationships. The idea is romantically appealing: your partner complements you, filling in what you lack. The introvert falls for the extrovert. The planner falls for the spontaneous adventurer. The rational thinker falls for the emotional feeler.

What the Research Shows

The research is clear and has been replicated for decades: similarity predicts attraction far more consistently than complementarity.

Byrne's (1971) "attraction paradigm" demonstrated that people are attracted to others who share their attitudes. The more attitudes two people share, the more they like each other. This finding has been replicated hundreds of times across cultures.

The similarity effect extends to: - Values (the strongest predictor of long-term compatibility) - Personality (people tend to pair with similar, not opposite, personalities) - Attitudes and beliefs (political, religious, social) - Education and intelligence (educational assortment is strong) - Background (socioeconomic, cultural, ethnic) - Interests (shared activities predict relationship satisfaction)

What about complementarity? A few specific studies have found weak evidence that some complementary traits may be attractive (e.g., dominant people may prefer submissive partners in some contexts). But these effects are small, inconsistent, and vastly outweighed by the similarity effect.

Why the myth persists: The dramatic narrative of "opposites attracting" is more interesting than "similar people find each other." We notice and remember the few opposite-attracting couples we know (they're salient because they're unusual) and overlook the many similar-attracting couples (they're invisible because they're the norm).

Verdict: "Opposites attract" ❌ DEBUNKED — Similarity predicts attraction far more consistently than complementarity. Shared values, attitudes, personality traits, education, and background all predict both initial attraction and long-term relationship success. The "opposites attract" belief is a cultural myth contradicted by decades of research. Evidence: Byrne (1971), replicated extensively. Montoya, Horton, & Kirchner (2008) meta-analysis confirmed the similarity-attraction effect.

The 36 Questions That Make You "Fall in Love"

The Pop Claim

In 2015, a New York Times essay titled "To Fall in Love with Anyone, Do This" went massively viral. The essay described Arthur Aron's 1997 study in which pairs of strangers answered 36 progressively personal questions and then stared into each other's eyes for four minutes. The claim: this procedure can make you fall in love.

What the Study Actually Found

Aron, Melinat, Aron, Vallone, and Bator (1997) tested whether self-disclosure between strangers could generate feelings of closeness. They found that the 36-question procedure increased interpersonal closeness (measured by the Inclusion of Other in Self scale) compared to small talk.

Key distinctions the pop version drops:

• The study measured closeness, not love. The participants reported feeling closer to each other — not that they had fallen in love. Closeness and love are different constructs.
• The setting was a lab, not real life. The artificial, structured environment is different from an organic relationship.
• One pair in the study later married. This single case became the narrative hook, but one couple out of dozens of pairs is an anecdote, not evidence that the procedure "makes you fall in love."
• The effect is about self-disclosure, not about these specific 36 questions. Any structured, reciprocal self-disclosure process would likely produce similar closeness. The specific questions aren't magic.

Verdict: "The 36 questions can make you fall in love" ⚠️ OVERSIMPLIFIED — Aron's study found that structured self-disclosure increases closeness between strangers — a real and interesting finding. But it did not show that the procedure produces love, only closeness. The distinction matters. The study tested one specific mechanism (mutual vulnerability) in a lab setting. Origin: Aron et al. (1997). The viral version: "To Fall in Love with Anyone, Do This" (NYT, 2015). The original finding is real (self-disclosure → closeness); the popular extrapolation (→ love) is unsupported.

Physical Attractiveness: Less Important Than You Think (Long-Term)

What the Research Shows

Physical attractiveness matters for attraction — this is well-documented and unsurprising. People rate physically attractive individuals more favorably on first impression across multiple dimensions (the "halo effect").

However, the importance of physical attractiveness varies dramatically by context:

For initial attraction and short-term relationships: Physical attractiveness is one of the strongest predictors. Speed-dating studies consistently find that physical attractiveness dominates initial mate selection decisions.

For long-term relationships: Physical attractiveness fades as a predictor. Once you know someone, personality, kindness, intelligence, humor, and shared values become increasingly important. Longitudinal studies find that initial physical attractiveness has a modest relationship to long-term satisfaction — far less than kindness, responsiveness, and emotional stability.

The matching hypothesis: People tend to pair with others of similar attractiveness level. This is well-documented in studies of actual couples (not just preferences).

The personality-attractiveness interaction: People who are liked for their personality are rated as more physically attractive over time. Conversely, people who are disliked become rated as less attractive. Personality changes perceived attractiveness — a finding that undermines the idea that physical attractiveness is a fixed, objective quantity.

Verdict: "Physical attractiveness is the most important factor in attraction" ⚠️ OVERSIMPLIFIED — Physical attractiveness matters for initial encounters and short-term relationships. For long-term relationships, personality, values, kindness, and responsiveness become more important. People also evaluate attractiveness differently once they know someone's personality.

Evolutionary Psychology Claims: Some Supported, Many Just-So Stories

Evolutionary psychology makes specific claims about mate preferences:

• Men prefer younger, physically attractive partners (signaling fertility)
• Women prefer older, resource-rich partners (signaling provision ability)
• Men prefer a low waist-to-hip ratio (~0.7, signaling health and fertility)
• Women prefer tall men with broad shoulders (signaling genetic fitness)

The Evidence

Cross-cultural surveys (Buss, 1989): David Buss surveyed 37 cultures and found some consistent patterns: men valued physical attractiveness more than women did; women valued earning potential more than men did. These findings have been replicated.

However: - Effect sizes are modest. The differences exist but are not enormous. Both men and women value kindness, intelligence, and personality highly. - Culture matters enormously. In countries with greater gender equality, the sex differences in preferences shrink. This suggests the preferences are at least partly cultural, not purely "hardwired." - Individual variation dwarfs average differences. The overlap between men's and women's preferences is far larger than the difference. Most men and most women want kind, intelligent, emotionally stable partners. - Many evo-psych claims are unfalsifiable just-so stories. "Men are programmed to prefer X because in the ancestral environment Y" is an adaptive story that can be told for virtually any preference. The story sounds scientific but is often untestable.

Verdict: "Evolutionary psychology has identified universal, hardwired mate preferences" ⚠️ OVERSIMPLIFIED — Some average sex differences in mate preferences are documented cross-culturally. But culture modulates these differences significantly, individual variation is large, effect sizes are modest, and many specific evo-psych claims are unfalsifiable just-so stories. The pop version overstates the "hardwired" aspect and understates the cultural and individual variation.

What Actually Predicts Who You'll Like

The research-supported predictors of attraction, ranked roughly by evidence strength:

1. Proximity. You are most likely to form relationships with people you encounter regularly — neighbors, coworkers, classmates. This is the single strongest predictor and the most underappreciated.

2. Similarity. Shared values, attitudes, background, and personality predict both initial attraction and long-term compatibility.

3. Reciprocity. You like people who like you. The knowledge that someone is interested in you is one of the strongest predictors of your interest in them.

4. Physical attractiveness. Matters most for initial encounters; decreases in importance over time.

5. Familiarity. Repeated exposure increases liking (the "mere exposure effect," Zajonc, 1968 — well-replicated).

6. Responsiveness. Feeling that the other person is attentive to your needs, understands you, and validates your experience.

None of these predictors are as dramatic as "36 questions to fall in love" or as flattering as "you're attracted to your opposite." But they're what the evidence supports.

Fact-Check Portfolio: Chapter 23

If any of your 10 claims involve attraction, dating, or what draws people together: - Does the claim cite research or cultural mythology? - Does it distinguish between initial attraction and long-term compatibility? - Does it account for the role of proximity, similarity, and reciprocity? - Is it making an evolutionary claim that's actually testable?

After Reading: Confidence Revisited

1. "Opposites attract." — What does the similarity-attraction research consistently find?
2. "36 questions can make you fall in love." — What did Aron's study actually measure?
3. "Physical attractiveness is most important." — How does its importance change from short-term to long-term?
4. "Evo-psych has identified hardwired preferences." — What role does culture play, and why are many claims unfalsifiable?
5. "Body language hacks increase attractiveness." — What is the evidence for specific body language techniques?