Studies of adolescents' sexual behavior have shown that
A) adolescent boys and girls go through different stages of sexual activity.
B) adolescents tend not to engage in sexual activity until the end of puberty.
C) adolescents are in a hurry to have sex, so they tend to begin with sexual intercourse and progress to more intimacy-based behaviors later.
D) the stages of sexual activity through which adolescents progress have not changed for many years.
D
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