Trollophilia? (j/k never heard of it)
Not mocking, just joking. Nothing wrong with it, I just don't know a name for it. As much as I like to argue someone like you might be good for me. :) Oh wait, was I supposed to argue? Does it happen with other people or just your boyfriend?
Well I don't know what it is called but I can guess what is causing it. The wires in your brain are getting crossed in the same way that some people are turned on by pain or by humiliation. Your brain is mistaking emotion or stress with arousal. Sounds like a good thing to me.