The essentials of vaginal fisting
Vaginal fisting (or fist-fucking), means inserting one entire hand into the vagina.

This - if done correctly - will usually result in a very violent orgasm, often combined with female ejaculation.  The fisting is usually done by the partner but occassionally women do it themselves.

The technique, described here, to a large extent is similar to the technique used for anal fisting.  Vaginal fisting is an intense play form that quite a lot of submissive women dream about.  They usually long for it as much as they fear it, especially if fisting is totally new to them.  The combination of fear and desire is what does the trick.  Fisting can be performed safely, provided you observe the precautions and technique below.

Be aware that not all women can handle fisting.  Some may simply be built too small, although this is uncommon.
The nonsense
Regardless what others may tell you, fisting - when done correctly - is not dangerous.  Many men are afraid their hands will be too big.  This can be the case, but usually it is not.  And: you don't have to have a baby first before you can be fisted, although there are some differences between women who have had a baby and those who haven't.
The objective
The objective is to create a violent, very satisfactory and usually revolving orgasm that has some similarities to giving birth.  Vaginal contractions will be much stronger and the orgasm can not be compared to any other.  This is due to the fact that the vagina is "filled" entirely and stimulated everywhere - especially the G-spot, the uterus and the bottom of the vagina - simultaneously.
Technical preparations
What you need is:
(a)  lots of lubricant - it usually helps to have either a dispenser or a small
      bowl available.
(b)  latex gloves.
Latex gloves
Do you wear them ALWAYS, to avoid damaging the tender inner vaginal tissue, disturbing the vaginal flora and kidney infections (caused by dirty hands or fingernails).  Cut and file your nails very short before fisting, even if you are wearing latex gloves.
Lubricant
A pro-tip - warm the lubricant slightly before use, for example, by putting the dispenser in a bowl of warm water.  It is much more comfortable for the woman NOT to get that cold splash just before the moment supreme.  It will also make it much more difficult to penetrate.  Use water based lubricant only (not butter, no oil or oil based substances, since this will ruin your latex glove and possibly the condom afterwards.  Most lubricants contain Nonoxynol.  Some women have allergic reactions to this.  If you are not sure, try a little bit on the armpit.  If the spot turns red and itchy after a while, find a lubricant without Nonoxynol.
Emotional preparations
Be aware that this may be an emotional barrier for your partner and talk it before you even attempt to do it.  No consent?  Forget it.  It wont work.  Remember that the vagina is the most precious female organ, designed for other purposes and women are usually very protective about it, for obvious reasons.

Next: it's good to know (if fisting is new to you) that the effect is intensely emotional and that after-care (always extremely important) is paramount in this case.
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