My current dog was not neutered when I got him from a "free to good home" newspaper ad. I delayed getting him neutered just because my budget was tight at the time. I kept him inside, and on a leash when outdoors, so there was no risk for making puppies.
A year or so later, the vet noticed some testicular irritation and recommended going ahead with the neutering to prevent any potential cancerous development. So I went and got him fixed. I didn't notice any difference in his aggression level, as he still barks whenever he sees or hears another dog nearby. He's a fairly mild-tempered, friendly dog, so aggression wasn't a big problem anyway.
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