I have very recently tried a few things with my dog after finally getting enough courage to try. I have found that she naturally really enjoys something about my crotch. It may be the smell or the taste but she goes and tries licking it whenever I have it exposed, even without any peanut butter or anything. However, she really likes to nibble on it and has made me bleed more than once. Other than that, I have a hard time penetrating her as she may be too small. I have seen others able to work it on much smaller dogs though so its a little confusing. Any help would be appreciated!