Which of the Following Statements About Marital Sexuality Is True

Which of the following statements about marital sexuality is true?

A) Until recently, oral sex was typically common only among the uneducated.
B) Women are more likely than men to have an extramarital affair.
C) Satisfaction with the quality and quantity of sexual activity is essential to a good marriage.
D) The frequency of sexual intercourse is fairly stable throughout the course of most marriages.