Which of the following has research found to be true of the presence of testosterone in men?
A. Testosterone, whether withheld or increased, has no effect on libido in men.
B. Men who have been administered testosterone report suppressed male sexual behavior.
C. Levels of testosterone are not correlated with sexual behavior in boys around puberty.
D. Testosterone seems to have an activating effect in maintaining sexual desire in men.
Answer: D
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