Final answer:
Buss et al. (1989) conducted a study on sex differences in mate preferences across 37 cultures, finding consistent preferences across cultures that suggested an evolutionary basis.
Step-by-step explanation:
Buss et al. (1989) conducted a study on sex differences in human mate preferences in 37 different cultures. The study aimed to test evolutionary hypotheses about mate preferences across cultures.
The researchers collected data on various mate preferences, such as physical attractiveness, financial resources, and ambition, from participants in each culture.
They found that certain preferences, such as youth and attractiveness in females and resources and ambition in males, were consistent across cultures, suggesting an evolutionary basis for these preferences.