"dominants, submissives, tops, and bottoms"
BDSM consists of bondage and discipline (B&D), dominance and submission (D&S), and sadism & masochism (S&M). The terms are lumped together this way because BDSM is a lot of different things to different people with different preferences all over the world. Invariably, a person's interests falls into one or two of those categories, rather than all of them. It is up to you to find what suits you best to get the most out of the art known as BDSM. Always remember that NO means NO and respect your partner or partners at all times to get the most fun from this anchent pratice but most of all you must enjoy it.