We’ve reblogged this illustration from Boyfriend and ExBoyfriend BDSM Gallery. He’s got great taste in NSFW pics too.
This is a regular series of illustrated guides. You can find the others here.
anal training: Inserting progressively larger objects (usually butt plugs or dildos) in order to stretch the anal sphincter, in preparation for such activities as anal sex and fisting. Safety note: Should proceed slowly and cautiously in order to reduce the risk of hemorrhoids or worse problems; the recipient should always be in control of the insertion.
pegging: (1) The practice of using a strap-on dildo for penetration (generally applied female-to-male anal). (2) Sitting on a “peg” (like a butt plug, but fixed in place) with the intent of expanding the anus to facilitate anal sex, fisting, etc. (see anal training).
FURTHER READING
• Gutenburg –Butt Plug