I did some searching, and I found two different articles on this subject. I hope they help.
A Fist Full of Vagina:
Fisting Made Easy
Yes, you can get your whole hand inside your partner's vagina. For women who are into massive penetration, nothing is a bigger turn-on. No experience is necessary; for either of you; but if your gal pal is a little roomy, or has given birth in the past, you’ll have an easier time. Otherwise, you may need to start off slow and work your way up.
A few words of caution before you roll up your sleeves and plunge in: fisting can result in injury to the fistee if not done properly. Trust and communication between partners is essential--and tons of lube helps a lot, too. Respect your partner’s limits and pain threshold. The following guide is intended for consenting adult partners who wish to engage in this act, and we assume no responsibility for possible injuries caused by or to those attempting it. That said, let these tips be your guide to safe and sane fisting.
1. Get her ready.
Make sure your partner is relaxed, turned on, and comfortable. When a woman becomes aroused, her vagina relaxes, expands, and lengthens; all very important for accommodating a fist. Also, make sure your hand is very clean and your nails closely trimmed.
2. Use lube.
Even the wettest vagina can use some extra juice during fisting; the more, the better. Two lubes I recommend are Astroglide and Liquid Silk. A latex glove can also reduce friction and is a good idea for safer sex purposes.
3. Start slow.
Start with one or two fingers and work your way up to three and then four. Most women need some time to further relax the muscles of their vagina, and some may require several stretching sessions, over weeks or even months, before you can actually get your whole hand in.
4. Duck inside.
As you add more fingers to your partner's vagina, squeeze them together so your index and pinkie fingers are under your middle and ring fingers. As you push further inside, tuck your thumb under your fingers. (Imagine you're making shadow puppets and trying to do a duck.) This makes your hand into a wedge shape that allows you to gradually stretch her open as you press on. Apply steady but slow pressure.
5. Let her lead.
Listen to your partner and let her tell you when to push, when to back off, when to add more fingers, and when it’s too much. Fisting can cause vaginal muscle and tissue injuries if you go too fast or too hard. Some pain during fisting is normal, but you have to take her word on the difference between a good hurt and a bad hurt.
6. All the way in.
The knuckles are the widest part of the hand and the most difficult part to get past the opening of the vagina. You’ll probably run into resistance at that point. Wait until your partner is ready before making the big push. She may be able to help by bearing down as if giving birth. Once your knuckles slip past the ring of muscles around the vaginal entrance, you'll find your whole hand enveloped in warm, wet pussy. Now roll your hand into a fist.
At this point, your partner may or may not want you to make gentle f***ing movements with your hand inside her, or stimulate her clit. Fisting produces extremely intense sensations for women, so ask her what feels good. When you’re done, make your hand into the wedge shape again, and gently slide out.
Safety and "how to" tips
This is a basic primer on fisting, including tips on how to do it and some important safety reminders.
What is "fisting"?
Everyone (well, almost everyone) knows what finger-f***ing is. Whether in the anus or vagina, it's terrifically enjoyable to stroke someone inside. (Fingers up a man's anus, if aimed properly, will tickle his prostate gland, which feels AMAZINGLY good... just a little tip!) And people are generally comfortable with the idea of finger-f***ing with more than one finger. But not as many people have been exposed to the idea of inserting a whole hand into the anus or vagina ... which is, in simplest terms, what fisting is. Yes, it's anatomically possible, and yes, it's EXTREMELY pleasurable. (I haven't experienced it, save vicariously.)
That said, it's now very important to explain what fisting is not. You do not make a fist and ram it home. Fisting is one of the most intimate and complete ways to touch another human being and it is something that has to be worked up to slowly and gently. There have been many posts about fisting on s.s.b-b, talking about the proper technique, the safety concerns, the fantastic feeling of openness and connection, the magical plane that two people fisting can attain... it's an incredibly intense way to make love. I can't do justice to the firsthand descriptions others have written, but I can mention some of the safety concerns.
Some safety issues
First of all, cut and file all your nails until every finger is as smooth as it could possibly be. Your fingers will be in some very delicate places -- places that may not have pain receptors. You want to make sure you minimize all chance of causing damage.
Use latex gloves. AIDS is a matter of life and death.
For anal fisting, you will probably want to clean your bottom's GI tract out. What else are enemas for? Be gentle with enemas; warm water is best. Don't use detergent in enemas.
Okay, now how do you do it?
Use LOTS (and I mean lots) of lube. Push it in with your fingers. Make a huge mess. Get it all over your hand, the back of your hand, between your fingers. Keep applying it as you go. You can't have too much lube. (And remember, oil-based lubricants dissolve latex). Some people like KY jelly; others say it dries out too quickly. In the UK, a substance called "Aqueous Cream" is the crème de la crème. Others use "J-Lube," which is a powdered concentrate that when added to water produces incredibly slippery goo; it's sold in veterinary supply houses! (Some people still use Crisco with latex gloves, on the theory that the Crisco is just the best lube, and the gloves don't break down that fast. This is risky, but it's an option.)
Go slowly. Start with one finger and work up. DON'T RUSH. Be sensitive to your partner's feelings. You are trying to persuade part of their body to open for you, to admit part of you deeply inside it. The energy will move back and forth, and you'll ride it, coaxing and pushing, in and out, moving your partner into a trance. Keep communicating with your partner; gags, or role-playing where the partner feels inferior or is told to stay quiet, may not be conducive to the kind of relaxation and open empathy you'll probably need if this is a first time.
If your partner’s bottom suddenly hits their limit, you'll know; their orifice will clench tight shut suddenly. DON'T PULL OUT. Stay right where you are until the contraction ends, THEN start pulling out. You can pull a muscle or two if you try to back out in the middle of a reaction like that. If this happens, it's OK; you'll know to go slower next time (if you both want to try again). But assuming all is well...
When you reach five fingers, you're almost there. Now is when you want to be most sensitive and most aware. Your partner is going to be flying on pain and pleasure; a sudden flinch and you'll find the vagina doesn't want you anymore. Respect that, and pull out (slowly!). But if your partner's bottom wants it, then you'll slip your knuckles inside, folding your thumb *inside* your fingers, and (so I've been told) your hand will NATURALLY form a fist -- you DON'T need to clench your hand or anything else! (Note: be careful with your nails as you form a fist).
Now the real fun begins... explore, entice, pleasure your partner’s bottom, who will be in heaven... and when it comes time to pull out, do so slowly and naturally!
Posted: 03 Oct 07:57