The authors examine a world-wide sample of cultures to assess whether the romantic-sexual kiss is a human universal. They also test for an association between romantic-sexual kissing and social complexity.

This study tests several hypotheses that men and women are differentially invested in their partner's sexual fidelity. Using a cross-cultural sample authors analyze women's and men's responses to sexual infidelity.

In order to evaluate an adaptive justification for restriction of ritualized physical contact, the authors test association between three manifestations of physical interaction and prevalence of pathogens cross-culturally. Their expectation, supported by two of the three tested hypotheses, is that higher pathogen prevalence will lead to customs of restricted physical contact. Both cultural and biological evolution are suggested to be influential in selecting for physically intimate behaviors.

This study negates the hypothesis that romantic love is unique to Euro-American culture and provides evidence of romantic love in the majority of cultures sampled.

This study documents the phenomenon of the 'femme fatale' (a dangerous woman) and 'status fatale' (a dangerous man) cross-culturally. The 'femme fatale' motif is practically universal. Data supports the idea that emotional involvement, rather than sexual gratification, was the primary motivation for seeking out a stranger of the opposite sex. A literature review is provided.

This study documents the phenomenon of the 'femme fatale' (a dangerous woman) and 'status fatale' (a dangerous man) cross-culturally. The 'femme fatale' motif is practically universal. Data supports the idea that emotional involvement, rather than sexual gratification, was the primary motivation for seeking out a stranger of the opposite sex. A literature review is provided.

This study tests several hypotheses that men and women are differentially invested in their partner's sexual fidelity. Using a cross-cultural sample authors analyze women's and men's responses to sexual infidelity.

This study tests several hypotheses that men and women are differentially invested in their partner's sexual fidelity. Using a cross-cultural sample authors analyze women's and men's responses to sexual infidelity.

This study tests several hypotheses that men and women are differentially invested in their partner's sexual fidelity. Using a cross-cultural sample authors analyze women's and men's responses to sexual infidelity.

This study tests several hypotheses that men and women are differentially invested in their partner's sexual fidelity. Using a cross-cultural sample authors analyze women's and men's responses to sexual infidelity.