L. G. A. Caral

Universal sex differences in the desire for sexual variety: tests from 52 nations, 6 continents, and 13 islands.

Karolien Poels, Martin Voracek, Bert Timmermans, 2003, Journal of personality and social psychology.

Patterns and universals of mate poaching across 53 nations: the effects of sex, culture, and personality on romantically attracting another person's partner.

K. Grammer, P. Shaver, M. Voracek, 2004, Journal of personality and social psychology.

Patterns and Universals of Adult Romantic Attachment Across 62 Cultural Regions

Allen I. Huffcutt, K. Grammer, P. Shaver, 2004 .

Are men universally more dismissing than women? Gender differences in romantic attachment across 62 cultural regions

Ikuo Daibo, K. Durkin, H. Euler, 2003 .