Alzu the thirstwolf is a Lyca, a species of humanoid canids. They have interesting laws, mostly to deal with the fact that once a month they all turn into giant, ravenously hungry nightmare wolves. 

One of their laws, and unrelated to that, is this; if you’re having sex with someone and they’re just really, really terrible at it, you are legally allowed to bite them (non-lethally) until they get the hint and leave. 

This is because the males have lube glands on their equipment which are quick to respond to arousal, where the females’ physical responses tend to be slower. The males developed lube glands in the first place because female proto-Lyca, unusually for non-sapient species, didn’t put up with an uncomfortable mating. That tendency to bite an inconsiderate male never really died out. It’s generally agreed to be very rude and worthy of biting to pay no attention to a partner’s discomfort. 

(now, if you ask them within the boundaries of their mythology why the lube glands exist, they’ll jokingly tell you that it’s because the sky-wolf who spawned them all was very much a top and, like most of them, had no desire to be confined to partners with a certain set of equipment.)