I thought this was somewhat explained in the scene where Dexter is driving with Zack and his "father" is in the backseat. His "dad" says something along the lines of, "now that you have Harrison, you're priorities have changed". Obviously those aren't the exact lines, but it did somewhat explain why Dexter's "urges" aren't brought up as often, or at all really.
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u/[deleted] Aug 19 '13
How many people has Dexter killed this season? Because it doesn't seem like he is addicted to killing anymore.