Problem: Which of the following statements is true about sexual activity in emerging adulthood? Group of answer choices Most individuals have had sexual intercourse by the end of emerging adulthood (age 25). According to Lefkowitz and Gillen, emerging adulthood is a time frame during which most individuals are unmarried but are hardly sexually active. Surveys usually indicate that slightly less than 10 percent of individuals have experienced sexual intercourse at the beginning of emerging adulthood (age 18). Casual sex is more common in the late twenties than in emerging adulthood.