BDSM 
(bē′dē′ĕs′ĕm)
(bē′dē′ĕs′ĕm)n.
A continuum of consensual sexual practices that includes bondage and discipline, dominance and submission, and sadism and masochism.
[Blend of B & D (from bondage and discipline), D & S (from dominance and submission), and S & M.]