Which of the following statements about sexual attitudes and behaviors among U.S. young adults is true?

A) Most young adults, whether single, married, or cohabiting, report some type of persistent sexual problems.
B) Adults in committed relationships are less satisfied with their sex lives than those individuals with many sexual partners.
C) Frequency of sexual activity is significantly higher in homosexual relationships than in heterosexual relationships.
D) Single adults have more sexual partners than those in committed relationships, but this does not translate into more sex.

D