I recommend as entertaining from the “Ow, I think that just bent my brain” point of view. Ethically nauseating Martians entertain themselves with awkward couplings of the zoophilia variety…this led to the uncomfortable realization that all human-alien erotica could be logically classified as zoophilia. Humans and Chimps are 99% similar after all. Thanks, Galaga. You owe me a drink.