Based on what we know about Remus's personality and how he feels about his condition I think he would have read every book on werewolves he could get his hands on. Which means werewolves mating must be extremely rare. Or Remus forgot. I mean he was pretty disgruntled when that conversation occurred.

As for Teddy if Jo says he isn't a werewolf he isn't a werewolf. However I think it is quite possible he could have side effects (like Bill). i.e. strong sense of smell, liking for rare meat, tendency to get aggressive when angry, ect.