Men's tendency toward large-group dynamics fosters competition and system-building. Women's focus on one-to-one relationships, rooted in the mother-child bond, cultivates intimacy and emotional expressiveness. These distinct social orientations help explain many psychological differences between the sexes.

The concept of a vast 'mating marketplace' driven by immediate value signals is a recent phenomenon. Evolutionarily, humans formed bonds based on long-term compatibility within small, familiar tribes, suggesting that today's dating apps create an unnatural and potentially detrimental dynamic.

There is a significant gap between people's stated preferences (what they say they want) and their revealed preferences (who they are attracted to in real interactions). For example, men and women both claim different priorities, but in speed-dating scenarios, both genders show strong attraction to ambitious and physically attractive partners with no significant gender difference.

Data and observation suggest women's sexual orientation is more fluid throughout their lives. Women are more likely than men to identify as straight for a period and later form same-sex relationships, indicating a higher degree of plasticity in female sexual preference.

The 'lie' of monogamy is not that it's a bad choice, but that culture has sanctified it as the only valid path. This framing turns non-monogamous people into villains and ignores that polygyny is the biological norm for most animals, including pre-agrarian humans.

When sperm donor half-siblings meet as adults, they may feel attraction. This isn't an innate desire for kin, but a consequence of shared genes creating highly similar preferences. They seem like a "perfect match" because the usual childhood-developed sexual aversion is absent.

Hormones shape brain circuits not just for attraction but also for aversion. This is seen in some male sheep ("gay rams") that consistently refuse to mount females, suggesting a powerful aversive component to their sexual preference, rather than just a lack of attraction.

Speed dating studies show couples who "click" are biologically in sync, even if a person violates the other's stated preferences (e.g., height, religion). This highlights the limits of algorithm-based matching, which cannot capture this multi-sensory phenomenon.

The largest sex differences in human behavior are in sexual attitudes (e.g., interest in casual sex, multiple partners). In these domains, gay men's preferences are typically masculine and align with those of straight men, challenging stereotypes that they are behaviorally "feminized" or under-androgenized.