Simply increasing dopamine does not necessarily increase libido, as excessive dopamine can prevent physical arousal.

“It is true that some level of dopamine or increase in dopamine is required for increases in libido. However, because of dopamine's relationship to the autonomic nervous system, and because the autonomic nervous system is so intimately involved, no pun intended, in sexual activity, in seeking and actual mating behavior, as I described earlier, it's actually the case that if people drive their dopamine system too high, they will be in states of arousal that are high enough such that they seek and want sexual activity. but they can't actually engage the parasympathetic arm of the autonomic nervous system sufficient to become physically aroused.”

“it's actually the case that if people drive their dopamine system too high, they will be in states of arousal that are high enough such that they seek and want sexual activity. but they can't actually engage the parasympathetic arm of the autonomic nervous system sufficient to become physically aroused.”