ishidashipper offers a quick zoology lesson...
Quite aside from the fact that dildoes don't "act like" anything- hello, inanimate object much?- this makes me want to set up a fuckin' Discovery Channel documentary or something. "Initally, the gentle dildo's habits may seem akin to those of the common penis..."
*cut to a shot of a beautiful herd of wild penii running free across the plains*
Their testicles would be their hooves! It'd be like they were waddling!
Context must be approached carefully, so as not to frighten it. (Comm-locked, QWP.)