Final answer:
According to the double standard in sexual behavior and CDC data, women generally tend to have fewer sexual partners than men.
Step-by-step explanation:
The question addresses gender differences in sexual behavior, specifically in the number of sex partners for men and women aged 20-24. According to the double standard outlined by Ira Reiss and data from the Centers for Disease Control and Prevention (CDC), it is suggested that women tend to have fewer sexual partners than men. This is supported by research indicating that the average thirty-five-year-old woman has had three opposite-sex sexual partners, while the average man of the same age has had twice as many, which can imply that this pattern may be consistent in the 20-24 age group as well.