A couple of Burgermons was shown during the 4th season, they had several Torikaraballmons as children. This is what I can't understand, in season 3 Renamon said Digimon doesn't have gender, but in season 4 there is evidence that they have. Presumably she lied because she is a kitsune, so is part of her nature to lie. I think they can sexually reproduce because evidences in season 4 indicates that.