6. A Chicken
As seen in: Pink Flamingos (1972)
Against expectation, poultry porn stars are a more common trend than one would guess. Well, Howard the Duck might've been a little more ready and willing than the helpless chicken caught between lovers in John Waters' controversial black comedy. More specifically, the bestial bedfellows rope the bird into what can only be dubbed one of the most fucked up three-ways on record, smashing it to death with their bodies in the act.
We can only imagine the PETA rallies if this was a recent release.