In the United States, the rates of adolescents having sexual intercourse by age ____

In the United States, the rates of adolescents having sexual intercourse by age ____
 
  a. are higher for boys than girls. c. are similar for girls and boys.
  b. are higher for girls than boys. d. are nearly identical for girls and boys.

Question 2

Which of the following is associated with sex hormones?
 
  a. the increase of thresholds for activation of brain pathways dealing with erotic content
  b. the decrease of thresholds for activation of brain pathways dealing with erotic content
  c. their formation during puberty
  d. their being dissimilar to adult hormones

Question 3

Which is an example of a primary sexual characteristic in puberty?
 
  a. deepening of boys' voices c. development of pubic hair in girls and boys
  b. development of breasts in girls d. penis growth in males

Question 4

All of the following are common behaviors of children ages 2 to 6 except
 
  a. they are uninhibited about their own nudity.
  b. they touch women's breasts and kiss nonfamiliar adults and children.
  c. they do not have much interest in sex play (for example, playing house; doctors; moms/dads).
  d. they touch their private parts, even in public.