This is one of my favorite ones:
A koala bear is sitting in a bar, having a few beers. A pretty lady comes up to him and asks him to buy her a drink. He, of course, does. After about an hour or so of this, both of them are starting to feel oozy. So, she asks him if he would like to go to her place. He agrees. Once they get there, she asks him to have sex with her. He says "Fine, but I\'m only good at oral" She doesn\'t have a problem with that so he goes down on her. He eats her out for a bit, enjoying the aroma. After he\'s finished, he gets ready to leave, but the lady asks him for money. And the koala bear asks her "why?" She tells him that she\'s a prostitute. He has no idea what that word means, so she tells him to look it up in the dictionary. He does, and it says the following: Prostitute- person who has sex for money. He nods and asks her "well, do you know what I am?" she says "no". he tells her to look it up, and this is what is says: koala bear- eats bush and leaves.
pretty funny, dont you think?