Beginners Guide To Chastity Part 1: Fitting and Measuring for a Chastity Device

Beginners Guide To Chastity Part 1 Fitting and Measuring for a Chastity Device, June 2021

*This guide is part of a comprehensive series on male chastity. Keep your eyes peeled for part 2, coming soon*

When deciding to purchase a chastity device, one of the most common requirements (especially among beginners) is that the device is completely secure.

Most people search for an inescapable device because it heightens, or corresponds with the fantasy that they are truly at the mercy of their keyholder and that without him/her present, they have absolutely no choice but to stay locked up and denied.

Fantasy never quite aligns with reality though and many people can become disillusioned with the idea of the chastity device, when they realise that they can probably escape.

There is simply no such thing as a chastity device that is 100% secure for 100% of men and many mass produced “one-size-fits-all” devices will be escapable for a large proportion of men.

This makes sense when you think about it more deeply.

The male genitalia varies (sometimes dramatically) between one man and another. I am not just talking about the length of the penis here, but the circumference at different points down the shaft, whether he is a grower or a shower and whether he is cut or uncut.

On top of this, the penis is extremely flexible and it can be squashed, squeezed, stretched and compressed out of the smallest of gaps and the tightest of rings.

It can even retract into the body. That is just the way it is designed. Of course, similar applies with the testicles and scrotum, which can also vary in size and shape. 

The testicles might sit high and tight on some men and hang low on others. For most men, the scrotum will tighten and relax as conditions change. With such differences, it is difficult for the one-size-fits-all device, to comfortably and securely fit every man.

Rather than experiencing disappointment at your ability to wiggle free from your chastity device, I recommend focusing your attention on what chastity is really about. You cannot force somebody into chastity (fantasy play aside) and it should be a mutual experience than you have both consented to participate in.

The chastity device should be a constant, but pleasant reminder of your predicament and your desire to please and obey your keyholder.

This requires a level of mutual trust and honesty and if you find yourself lying or withholding information from your keyholder (by masturbating secretly or not obeying the rules set out) then perhaps you need to re-evaluate the conditions of your chastisement with your keyholder and discuss whether chastity is right for you.

Chastity and orgasm denial can be enjoyed in many different ways and you want to find out what works best for you. 

Check out my “Orgasm Denial Games and Ideas” post may help.

Instead of focusing on finding an inescapable cage, your main priority should be to find a comfortable cage. This is especially true if you are interested in long term chastity.

Lots of people believe that they should choose the smallest, tightest fitting device, in the hopes that they will not be able to escape, but this is counterproductive in long term chastity. If you have to remove the device and leave it off for extended periods of time due to discomfort or pain, then the chastity device can lose its psychological power and you could lose interest.

Sizing yourself for a comfortable, long term chastity device is not easy. For most men, it takes a good amount of trial and error to find their most suitable device. This can be frustrating and costly, because chastity devices don’t run cheap.

There are some tips and tricks to help reduce the chances of purchasing an incorrect fit, but even these are not an exact science and mistakes can be made.

Measuring For A Comfortable Chastity Device

Measuring For The Main Ring

The most important measurement to get as accurate as possible is the size of the main ring. (The ring that circles your testicles and penis) An incorrect fit here can cause a whole host of problems later.

If this ring is too large, the cage will slip down, or fall off entirely. If the ring is too small, you will suffer discomfort and pain, fluid retention and cutting off the blood supply to your genitals.

The best fit is one that feels snug enough to avoid slipping, but loose enough that blood can flow and you feel comfortable.

There is a huge difference between having “blue balls” (The slang term to describe an ache in your testicles due to being denied orgasm) and actually having blue testicles.

If your testicles are turning red, purple or blue, the main ring is too tight for you and you should remove it immediately and try the next size up.

It is very difficult to get an accurate measurement for the main ring, using a tape measure. Some people recommend tying some string around your genitals and measuring that, but even this is not ideal.

The best method I have discovered for getting an accurate measurement is to pay a visit to a sex shop, or a hardware store and purchase a selection of rings, starting from roughly 2 inches in diameter and reducing in size by ¼ of an inch. Make sure the rings are made from a solid material (metal or plastic) as stretchy materials will give you an inaccurate result.

You also want to make sure you choose smooth, rounded rings that will cause no irritation during wear. Starting with the largest, work your way down the sizes until you find one that fits snugly, but causes no pain, redness or swelling to your genitals.

When you have whittled your way down to a few rings, wear each one for a few days solid (including at night), to get a better idea how that ring feels in every condition. Some mass produced devices, like the CB6000, come with multiple main rings of varying sizes, these may help lots of men find a good fit, but is not guaranteed (you could be between sizes).

(Note: Erections, especially nocturnal, can cause some discomfort, because your genitals swell and the ring begins to constrict you. With the right size ring, you might experience some mild discomfort from erections, but you should not be experiencing pain.

If you feel an intense burning under your testicles, or a deep aching in your testicles and stomach, then it is time to change the ring)

Measuring For The Cage Length

The length of the cage is somewhat important. Ideally you want a cage that is just long enough to allow the tip of your penis to come to rest at the end of the cage. If your cage is too small, it could make you feel like your penis is being constantly “held back” inside the body a little, your glans may bulge uncomfortably through the end hole, or your penis may bunch up towards the base.

For uncircumcised males, the foreskin may protrude from the end of the device and get pinched. A cage that is too long will not cause any major issues, but it could cause urine to get splashed inside the device, which builds up moisture and odour.

To measure the length of your penis for a chastity device, you can take a ruler and place it on the underside of your flaccid penis, measuring from tip to base. Do not press the ruler into your scrotum, as this will give you an incorrect measurement.

Just allow the ruler to make contact with the skin there. You should be completely flaccid when taking this measurement, but not the “retracted inside the body because it’s cold or scared” type of flaccid. 

For accurate results, take this measurement several times throughout the day, to find your most common length. When you have found your measurement, deduct a ¼ to a ½ inch off the final results and this will be your ideal length for a cage.

Measuring For The Cage Diameter

Measuring for the cage diameter is less important, but a correct fit here does have some benefits, like increased comfort and making less mess inside the cage when you pee.

Some people recommend a cage that hugs the penis, making contact with the skin all the way around, but not feeling tight.

Personally I recommend the cage be looser than this, because it allows air to circulate. A clammy, sweaty penis builds up odour faster and dark, damp conditions can cause issues with infection.

Also bear in mind that your penis will naturally pull back, or retract into your body during movement or in certain conditions and if the cage was tight to begin with, your penis may not be able to move forward again and so it stays bunched up.

Bunching can cause skin to bulge or become trapped and pinched. I guess the choice is yours whether you prefer a snug fitted cage, or one that allows some wiggle room, but we prefer the latter, even if it does mean he can get semi erect.

The Importance Of Spacers

Another important measurement to be aware of is the gap between the main ring and the cage section. With most mass produced, trapped ball devices, you will be supplied with a few spacers and these little objects are used to increase or decrease the gap between ring and cage.

The reason this measurement is important (especially for those looking for a secure device) is that it is often these unassuming little spacers that help reduce your ability to remove the cage.

The smaller the gap between cage and main ring, the more difficult it becomes to slip your penis and testicles out of the device. Of course, opting for the smallest spacer immediately may cause some discomfort. It’s all about finding the snuggest, comfortable fit for you.

If purchasing a secure chastity device is still of utmost importance to you, there are some things you can do to help reduce the chances of escape from your chastity device.

One of the first is to go right ahead and purchase a custom built chastity device that has been made to fit your exact specifications, but even this is not a guarantee (I refer you back to my comment about how flexible the penis can be).

Another option is to consider purchasing one of the many add-ons available (make sure the one you choose fits your particular device), which aim to reduce or stop you from pulling your penis backwards. (Chastity belts may also help to stop the cage from sliding forward, making it harder to slide your penis out).

Add-ons can be as simple as the KSD-G3 (a wedge shaped piece of plastic that helps prevent pull out in CB devices), to the more extreme. Some cages come with deep urethral plugs and even options to secure a Prince Albert piercing.

I recommend careful consideration when deciding whether to purchase these add-ons; the last thing you want is to have to remove your device due to tearing, irritation or infections. I will discuss these add-ons in more detail in another instalment to my chastity series.

Ready to shop? Take a look at the wide range of chastity devices available here at Uberkinky.co.uk

About the Author

Hi! I’m The Gritty Woman. I'm the writer, photographer, and creator of thegrittywoman.com, a leading sex blog, where I share my personal experiences and knowledge on sex, sexuality, body positivity, BDSM and kink.