It turns out some dirty tree huggers are doing much more than just embracing the giant wooden penises growing in your backyard. Also known as arborphilia, dendrophilia denotes a love for trees. This only qualifies as a sexual fetish when the tree lover in question takes their relationship to the next level and derives sexual satisfaction from these leafy giants, whether that involves licking bark or some good old fashion tree humping. Dendrophilia can be considered a class of objectum sexuality, in which a person develops romantic desires for inanimate objects. Some Freudians believe this arousal may be because trees are giant, crooked phalluses, with infinite smaller penises branching off.