How do you know when a relationship has become abusive? At what point should you just walk away?
Are there varying 'levels' of abusiveness?
How do you know your partner is being abusive, and not just a dominant personality? What if you're already in a relationship where power exchange already happens (eg AB, BDSM), when do you know that your partner has gone from simply being dominant to being abusive? How can you make that differentiation?
This has bothered me for a while. All opinions welcome, and then after a few replies I'll post my own.