How about this one? I swear, if this isn't sexy enough for you, then we'll just have to get you castrated.
Hmmm.. castration, that could be entertaining. If you want to get castrated, go ahead and jerk off to this image, then crawl back to your cage and wait while I arrange the procedure.
Oh, what if you don't want to be castrated? Hmmmmm.. why don't you just rub around the head of your little pee pee about a dozen times... each direction.