Here are all the facts, experiences, techniques and media/links we have on:
If it involves Anal play, you MUST have LUBE and Patience....
Sexual arousal and/or orgasm achieved by self-stimulation of anal region using
fingers, vibrator, dildos etc.
Anal masturbation, as far as in a man, can stimulate the prostate
gland, a walnut sized muscle located 2-3 inches inside the rectum. As
seminal fluid is created here, this can result in a larger amount of
ejaculatory fluid during orgasm. Men who abstain from penile
stimulation during chastity can be 'milked' this way to relieve the
build up of seminal fluid.