Sadism and masochism isn't just about bdsm. I'm a masochist but I don't like most tof the bdsm scene. I like to be dominated, held down, that sort of thing. Same with sadism, it doesn't have to be violence or tying people up, it can be something as simple as verbal, like degrading or praising them.
They called themselves a sadist and masochist, but they didn't even do any bdsm. I'm disappointed. I thought this was going to be more spicy.