FH's College Friends

So like many other people, I have a wedding website with info about hotels etc. The link was on our STD magnet. FH's college friends (who I have never met) think it's funny to keep signing the guestbook about how drunk they are planning to get. Now it's getting vulgar! I was so mad!!! FH is making them stop but I'm getting nervous. I hope they're kidding! They are all married and in their mid-30's. Most have kids and live out of state so I think they plan on coming without their wives. HELP!