While I generally agree with this comment, for me the one point that bothered me about the original poster was that they did not lock the door. Moreover, after several folks pointed out the door should be locked, she only went so far as to say that was “probably” a good idea. To me, locking the door is required and just common sense if anyone else is in the house. In any case, together, those two facts make me think that the OP and her DH are at least a bit less private than I would hope for out of a couple watching my children.
Also, for those folks that seem to be on the path of you can’t let this affect your marital relations, I think it is fairly common that couples do lots of things, like having visitors over, that for many couples do affect whether they have relations that day. I personally see nothing wrong with that. It’s not like they were forced to accept these girls. If they know that the parents are not comfortable with them doing this, they should be upfront about it and not have the girls over. By this I mean, for example, it is a couple’s “right” to watch an R rated movie in their own house if they want. But, if they are watching someone else’s children that night, I think the parents of the visitors are fine if they say that they don’t want their children exposed to that. Then, one of a few things can happen. The couple watching can agree and not watch the movie, or they can disagree and then the ball is back in the parents’ court–find another place for the kids to stay, or accept the less than desirable accommodations if necessary.
OK, I’m done spewing words.