Yknow those stags and birthday parties and office parties where there's a big cake which is only part cake cos there is some big titted slut inside that pops up and out of the cake to entertain everyone ?...level of entertainment dependant on level of cash being paid of course...

My thinking is for the truly slutty chicks that you really want for these parties to make sure they go how you want them to, you first test them by giving their face one of these special frosting jobs before they get in the cake...gets the caterers some action and means you can get away with tipping them less too.