If you want to engage in sexual relations with a deer, you are committing bestiality, even if you think you are “deerkin”. Claiming to be a “deerkin”, though might allow you to get away with claiming insanity…
The “deerkin” does specify if they are male or female, or whether they fancy bucks or does. It is a question that one can but hope will never be answered.
It does make one wonder what really happened to Bambi’s mother…