I've never over-breed, and I tend to pull males early, or at least before more breeders.
If the male stops eating (not all stop), is when I start looking for signs of when to pull them for the season. If a male loses weight, enough that I visibly see a little bit of sagging, I pull them and they're done. I also pull them if the female or male becomes completely disinterested for more a month. If seeing multiple females, I do this if he's disinterested in more than two females. I will give him an extended break (2 weeks), see if it improved, if not he's off.
Those are basically what I look for. Mostly the weight. Otherwise it's up to the breeder, if you feel uncomfortable with keeping a male in, pull him out.
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