By age 20, what percentage have not had sex?

• A. some (25%) have not had sex
• B. few (15%) have not had sex
• C. a moderate number (40%) have not had sex
• D. the majority (65%) have not had sex

Answer: (B)

This question tests how common sexual activity is by early adulthood. By age twenty, most people have started having sex, so the portion who have not yet had sex is a relatively small minority—around fifteen percent. That makes the option describing about fifteen percent the best fit, since the other options imply much larger abstinence rates (a quarter, forty percent, or sixty-five percent), which don’t align with how common sexual debut is by this age.