My first girlfriend enjoyed biting. Although, I have a low threshold of pain, but I managed.
One of my best friends has a thing for really intense bites. Like, sick-nasty major bruise-inducing bites. She also really enjoys gore, so if you made her bleed from a bite she'd like it even more.
... Yeahhhhh.
As for trying-to-kill-me bites, I've never had those outside of my cat.