Orgasm control (also known as extended orgasm) is a sexual technique involving an active partner taking control over a passive partner's orgasm. The technique can be used by anybody regardless of sexual orientation. Orgasm control is sometimes called "slow masturbation", but any method of stimulation (such as oral, sex toys or intercourse) can be used by the active partner, not just manual stimulation.
Typically, the active partner will give slow, gentle stimulation to the passive partner, gradually bringing them up to the point very high in the plateau phase where an orgasm is actually building, but will then reduce the level of stimulation just below that needed to trigger the orgasm. By carefully varying the intensity of stimulation, the passive partner is held in this highly-aroused state near orgasm. This process may be repeated as desired, but repetition causes the passive partner's urge to orgasm to become overwhelming.
When the active partner eventually provides the passive partner with enough stimulation to achieve an orgasm, it may be stronger than usual due to the increased tension and arousal that builds up during the extended stimulation. The aim of orgasm control is to prolong the powerful sexual sensations that occur during the final build-up to orgasm. It is a form of negative feedback.
The physical demands of being kept in this highly-excited state for a time can induce a very pleasurable, almost euphoric state in the passive partner. An active partner may derive pleasure from witnessing their partner in such an excited state as described in Expanded orgasm.