This article is from the Magick Tantra FAQ, by Tyagi Nagasiva email@example.com, Catherine Yronwode firstname.lastname@example.org with numerous contributions by others.
Male avoidance of orgasm is central to certain branches
of tantra yoga as well as some tantra-like practices of
non-Asian cultures, such as "male continence." Karezza
teachers recommend avoidance of both male AND female
orgasm except at specific times (e.g. when the woman
is menstruating or when the couple wishes to conceive).
The degree of emphasis placed on orgasmic avoidance
varies from teacher to teacher. In some radical Indian
lineages of tantra yoga, irreversible genital mutilation
of the male has been practiced to ensure the complete
impossibility of ejaculation. On the other hand, it
should be noted that there are sexual mystics, such as
the spiritualist sex magician Paschal Beverly Randolph,
who believe that avoidance of orgasm is a metaphysically
dangerous and possibly demonic enterprise and argue
strongly aginst it as "unnatural."