Final answer:
Norms regarding gender and sexuality vary across cultures, impacting sex research.
Step-by-step explanation:
Norms regarding gender and sexuality vary across cultures. Societies have different attitudes about premarital sex, age of sexual consent, homosexuality, and other sexual behaviors. For example, Scandinavian students tend to be more tolerant of premarital sex compared to U.S. students, while non-Western societies like China and Iran value chastity highly in a potential mate. These variations in cultural norms impact sex research.