“How do I measure for a chastity device?”
I get this question a lot. Just yesterday, someone on Twitter asked for the advice. I’ve never put it all in one place but have decided to do so for two reasons. First, it’ll make those looking for the information more likely to find it and, second, it’ll save me the time of having to say it over and over. And over again.
There are three measurements you need if you’re trying to size a trapped-ball style chastity device even if you’re going to buy a mass-produced one (like the Holy Trainer or CB-6000):
- Flaccid penis length (tube/cage length)
- Flaccid penis diameter (tube/cage diameter)
- Circumference of both the penis and testicles combined (A-ring circumference)
You may also need to specify the gap width between the tube and ring but I’ve always left that to the manufacturer’s default and been satisfied. As far as I know, the only plastic device that lets you play with this is the CB-6000. The others are fixed.
In my experience and opinion, erect size is not a thing you have to worry about since the entire purpose of a chastity device is to arrest and defeat an erection. I’ve been asked if this is still the case for someone who’s a “grower” (i.e., their flaccid size is far smaller than their erect size) and my guess is no, but I don’t know for sure. I’d be interested to hear the experiences of others in this regard. My hunch is the difference would have to be really big for the erect size of the penis to be an issue. Chances are, sport, that ain’t you. But every penis is like a snowflake: unique. What’s worked for me or the majority of men may not work for all of them.
Also, with regard to issues of erect size, you won’t be doing yourself any favors if you buy a device with room in it thinking it’ll be better for when your dick tries to get hard. Smaller devices are more comfortable than larger ones (as unintuitive as that sounds). If you give the penis a little room to grow inside the device you will experience more pain and discomfort than otherwise, based on my experience. Therefore, you want to determine the normal size of your penis when it’s flaccid and size the device to that.
The thing every owner of a penis knows is that they’re all over the place with regard to size. They shrink up and they plump out (even when you’re not turned on) and can be any size in between. The same goes with scrotums. They’re constantly moving around (seriously, just sit and watch them someday). It is their function, after all, to maintain the temperature of the testes the best they can and that means pulling them closer or letting them hang farther away from your core body heat. Also, some men are “high and tight” in that their scrotums don’t hang down very far at all even when they’re at their most relaxed. Wearing a device is more difficult for these guys, especially at first. Over time and with extended wear, a chastity device will actually stretch a scrotum a bit and loosen that skin up, but it takes a while.
But anyway, as I said, “normal” flaccid size is what you’re looking for. This means a few things. First and most important is to take several measurements over time and at different times. I’d recommend something like 10 or 12 over a few days. Second, try your hardest not to think about what you’re doing. You’re measuring for something that very likely turns you the fuck on so watch Old Yeller or pay your taxes of something beforehand to get your mind off the topic entirely. Otherwise, you know what will happen. Bottom line, nobody knows your penis as well as you do. You know when it’s smaller or larger than normal. If you’re still unsure, err on the short side. If this is a problem for your ego…I can’t help you with that.
Different manufactures use different methods of measuring so make sure you communicate how you did it to them at the time you order. Mature Metal, for example, says you should measure the bottom of the penis. Typically, the penis is measured from the top (at least in my opinion) at the point where its shaft meets your’ pelvis down to the tip. Simple enough.
Most manufacturers want to know the diameter of the penis shaft when ordering. You can eyeball this from above with a ruler but, since penises can sometimes be thicker vertically than they are horizontally, a more accurate way to measure it would be to find diameter from circumference. This can be done a couple different ways. One simple method is to wrap a length of string around it and then measure that against a ruler or tape measure. Alternatively, if you have a tailor’s-style tape measure, you could use that. Once you have the circumference you can find your shaft’s diameter by dividing it by our magical friend π (3.14).
The string method is probably the simplest way to find the total circumference of the entire package though a tailor’s tape is also workable. Mature Metal offers sizing rings to help determine the A-ring size, though remember you’re not sizing a cock ring. Cock rings need to accommodate a full erection and chastity devices don’t necessarily. Initially, I wore a ring that was too big because I sized myself after wearing it all the time, even when I woke up with a raging morning erection.
It’s also worth noting that I’ve found the size A-ring your body can tolerate will change over time, especially during the early days. When first starting out, I discovered I needed a ring that was 2″ (50mm) in diameter. The one I spend most of my time in now is just over 1.5″ (40mm). That’s a huge size swing but it didn’t happen over night. I wore a 45mm ring for several months before moving to 40mm. I think the perfect size for me is actually right now about 42mm. Yes, two little millimeters makes a big difference. What I’m getting at here is you may want to consider ordering two rings up front.
Note that significant changes in your weight or fitness level will also impact the size ring you wear. I’ve needed a slightly larger ring after becoming more active (even though that resulted in weight loss).
The other thing to consider when sizing for an A-ring is the material the device will be made of. Metal is heavier, of course, and I’ve found a ring that fits well when it’s made of lighter plastic will feel too big when used for a metal device.
Another thing I can say about A-rings is they’ll be more comfortable if oval-shaped (sometimes called “anatomically shaped”). It leaves more room for the spermatic cords and vas deferens and other associated plumbing. Constriction of these is the leading cause of pain while in chastity, I’ve found.
Eventually, what you’re looking for is a ring that is snug, but not too tight. You should be able to get your little finger under it when flaccid. When hard, as long as your balls aren’t turning purple and getting cold, it’s not too small. If you’re experiencing testicular pain like a mild version of getting kicked in the balls, it’s probably a little too small (or round). Perfect world, your balls don’t hurt or turn blue (though they may turn a darker color red) but it’s still snug. If the device hangs too low or you can get your fingers through when hard, it’s too big. If your balls pop though when flaccid, it’s also too big (remember, “trapped-ball”). Yes, this is complicated stuff, but there’s a lot of complicated plumbing down there and sensitive tissue.
Of course, all this precise measuring is only really necessary when ordering custom. I DO NOT recommend anyone start out with chastity that way. First thing you should do is buy a plastic device. I recommend the Holy Trainer at the moment but the CB-6000 is also popular for some reason. Get the device that best fits your proportions. In the case of the tube, err on the short side, and in the case of the ring, err slightly larger.
It’s entirely possible you still have questions after all this or comments from your own experience. If so, please feel free to leave a comment below.
