Wikipedia
Coitus reservatus (coitus, "sexual intercourse, union" + reservatus, "reserved, saved"), also known as sexual continence, is a form of sexual intercourse in which the penetrative partner does not attempt to ejaculate within the receptive partner, but instead attempts to remain at the plateau phase of intercourse for as long as possible avoiding the seminal emission.
Alice Stockham coined the term karezza, derived from the Italian word "carezza" meaning "caress", to describe Coitus reservatus, but the idea was already in practice at the Oneida Community. Alan Watts believed, in error, that karezza was a Persian word. The concept of karezza is loosely akin to maithuna in Hindu Tantra and Sahaja in Hindu Yoga.
Control of ejaculation is a key aspect of Taoist sexual practices (known as "cai Yin pu Yang" and "cai Yang pu Yin").