Final answer:
Evolutionary psychologists would attribute gender differences in attitudes toward casual sex to men having greater sexual urges than women.
Step-by-step explanation:
Evolutionary psychologists would be most likely to attribute gender differences in attitudes toward casual sex to the fact that men have greater sexual urges than do women. According to research, men are generally more motivated to engage in casual sex and tend to have more sexual partners throughout their lives compared to women. This can be explained by evolutionary theories that suggest men have evolved to seek multiple mates in order to maximize their chances of reproductive success, while women have evolved to prioritize long-term committed relationships for the benefit of their offspring's survival.