16. According to a large scale U.S. survey based on a nationally representative sample of 19 to 59 year olds, Laumann and colleagues (1994) found that A) single adults who do not cohabitate were more sexually active than married adults B) cohabitating adults were more sexually active than married adults C) men and women have sex with a partner about equally often, but men masturbate and fantasize about sex more often than women do D) all of the above E) only B and C above
