Ritual magic is the performance of a ritual for magical purposes.
Practically all magical traditions include ritual magic. It may be highly complex and include nearly all of the magical system such as in hermetic or salomonic magic, or be merely a more extensive form of intuitive and informal magical practices as in shamanism or chaos magic.
As opposed to religious and social rituals, magical ones are not necessarily repeated in the same or a similar way on certain occasions. However, there always are elements and symbols that appear throughout a single tradition and just like other rituals, ritual magic usually uses a special ritual space. General forms of ritual such as the rite of passage or the rhythmization of daily life are usually incorporated into a magical context by magic practitioners.
External Links
RitMag (http://www.ritmag.info/index2.html) Thoughts on ritual magic
ritualmagick.org (http://www.ritualmagick.org/) A Wiki dedicated to Ritual Magick
Magick is an alternate spelling of magic, coined by Aleister Crowley to differentiate "the true science of the Magi from all its counterfeits.
Magick is not capable of producing miracles or violating the physical laws of the universe (i.e., it cannot cause a solar eclipse), although "it is theoretically possible to cause in any object any change of which that object is capable by nature", according to Crowley.
One particularly interesting form of ritualistic sex magick is based upon the polyandry concept of one female having sexual relations with two or more males during a single ritual and allowing their semen to mix within her body.