Final answer:
The factor that is NOT a factor in changing contemporary attitudes toward sex is more narrow standards of acceptable gender-related expression. Increased inclusion and acceptance characterize modern attitudes towards gender and sexuality.
Step-by-step explanation:
The option that is NOT a factor that accounts for changes in contemporary attitudes toward sex is b. More narrow standards of acceptable gender-related expression. In fact, the trend has been towards broader and more inclusive standards of gender expression. When sociologists study sexuality, they focus on sexual attitudes and practices within a cultural context. In the United States, sexual attitudes tend to be fairly conservative, and as a result, sex education programs may be limited. Influences on sexual attitudes include family, peers, media, and religion, with peers and media becoming strong influences in recent years. Urbanization, a decline in church attendance, and a widespread desire for individualized expression in personal lifestyles contribute to changing sexual norms, whereas narrower gender expressions would not support this trend.