Ruined orgasms are orgasms that are purposely halted as part of tease and denial play. A partner is stimulated through various sexual acts to the very brink of climax until stimulation is abruptly ceased.
In some instances, the orgasm does not happen, and whether more stimulation occurs depends on the scene or relationship dynamics. In other circumstances, the orgasm does happen, but it is perceived to be less intense and satisfying. The result is meant to be frustration at the sudden end of pleasure. In fact, as part of the tease and denial play, it will heighten the sexual experience.