They are also allowed to go to the Adventurer's Club, which is a great time, some of the humor is a little iffy for the younger crowd, but it never get's salacious, if you don't mind them hearing a few dirty jokes (mind you though, there is no profanity) , which never get too out of hand, then bring them there, it's a lot of fun, I've seen as young as a 10 year old in there, but this is all up to you.
EDIT: also, one more precaution, it doesn't happen too often, but there may be the occasional person who is, needless to say, a bit "loaded" if you know what I mean, but out of the majority it's a small percentage, but I suggest you take a night there by yourself first in order to get your opinion.