It makes sense that you don't introduce the guys you date to Nugget until you have a chance to check them out and really get to know them first. One can only guess at what kind of message it sends to the kids when there is a parade of the folks they're dating coming and going.
Indeed, Me and my GF waited I think 8 months, and were totally sure that this was a "serious" relationship, before we brought our kids into the picture. As much as you want to share your pride and joy with someone you care about, you have to make sure they are going to be around for a good long time.
Now our kids are thick as thieves, and my daughter refers to her as her "little sister"..and vice versa. Thank god, because that would have SUCKED the anus if they didn't get along