Often men will seek stimulation of the anus/prostate while also enjoying stimulation of the genitals and will then ejaculate in the usual way.
This nonetheless is not the same thing as orgasm by anal/rectal stimulation alone.
Some users of prostate stimulating devices such as the "Aneros" report orgasmic experiences not involving genital stimulation and which are said to induced solely these devices. The overwhelming nature of these orgasms has given rise to the popular term "The Big O".
Other men take anal/rectal exploration further and insert larger objects in the rectum and even in the lower colon. In such cases it must be assumed that the pleasure arises from the "full" feeling rather than the stimulation of nerve endings, because the higher one goes in the rectum the fewer nerve endings there are to stimulate.
A practice which has become relatively common in recent years is anal fisting or handballing, which involves passing a hand through the anus and into the rectum and higher.
Fistees commonly report orgasms that are qualitatively different from those obtained by genital stimulation. Furthermore the orgasm is not followed by a refractory period and the fistee may a experience a number of orgasms on after the other.
The anecdotal evidence for such orgasms suggest that other mechanisms come into action during fisting (and big dildo play), possibly involving the muscles of the pubo-rectal sling and the nerves of the autonomous nervous system. "
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