Josh's remarks are too cool to be left in "Comments"
When I asked what would happen if a werewolf guzzled chocolate, Josh (author of PET HATES) said...
Werewolves and chocolate? Real (high-cacao) chocolate would certainly excite them as their livers would be intermediate between humans' and dogs' at metabolising theobromine. There's a possibility that they could have fatal seizures. On the other hand if you palmed them off with the inferior so-called chocolate that many Brits seem to love then they might explode with rage.
As for animals with strange, expanding genitalia (of the sort that develops a natural "anchor" to keep the male parts inside the female parts for prolonged coitus).
Interrupted mating? There's a possibility that you'd be severely bitten! The genital tie is very firm.