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Here are all the facts, experiences, techniques and media/links we have on:

Anal Masturbation

With contributions by CraigLikesToPlay. - Thanks!

SAFETY NOTICE

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.

From Milovanians

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.