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CB6000 vs Curve Sizing Guide and Help

Hello! I’ve been watching from the sidelines for a long time, but I finally decided to join this wonderful group. Last night I managed to tell my partner…

member_d309c3a090 24 Aug 2026 #1

Hello! I’ve been watching from the sidelines for a long time, but I finally decided to join this wonderful group. Last night I managed to tell my partner that this is something I really want to try—it took quite a bit of bravery to say it out loud, lol, especially since she’s usually pretty reserved. She looks a bit unsure right now, but the fact that she didn’t immediately reject it is good news:)

My current dilemma is deciding which device to begin with. I’ve narrowed it down to either the CB6000 or the Curve; I believe they come from the same manufacturer.

In terms of size, I consider myself more of a ‘shower’. My flaccid length hovers around 4 inches, perhaps stretching to 4.5 on a good day, and my girth is also about 4 inches when soft.

Would the CB6000 or the Curve suit me better? I’m having trouble making sense of their dimensions. The internal length of the Curve is listed as 3 3/4 inches, which just confuses me completely.

Any advice would be greatly appreciated. I am eager to place an order but don’t want to spend £100 on something that doesn’t fit properly.

Thanks, Tom

member_56a3d51043 25 Aug 2026 #2

Hi Tom, welcome to the Forum! I’d vote for the CB6000. Even though I’m more of a 'grower' than a 'shower', I think the length of the CB6000 will work well for you. The Curve tends to be less discreet compared to the 6000. It’s a smart choice to start with something from the CB series, as they offer very adjustable base rings and gap sizes. Best of luck!

member_75c78a1ec7 27 Aug 2026 #3

I agree with locked4her55. The Curve is massive for daily wear; I could never quite find a comfortable spot in it. Given your girth measurements, the Curve will likely add about an inch to your circumference, meaning you’ll be bouncing around inside. You might also want to check out dhgate. Members here often note that their devices tend run slightly large. They may have options that fit better for you. I believe they are priced a bit lower than the Curve.

member_d309c3a090 28 Aug 2026 #4

Wow, thanks for the quick reply and excellent advice. I’ll go with the CB6000 then! If possible, I have a couple more questions: The Curve will be quite loose as you mentioned, which isn’t what I’m after. Do you think the CB6000 feels really tight or just snug? I probably won't be conditioned to wear it super tightly. Another question: How did your partners react? Did they love it right from the start, or did their interest grow over time? I only briefly mentioned it to my partner last night. She wasn’t grossed out by it, but she didn’t look overly enthusiastic either. Hopefully, she’ll enjoy it as much as I think I will. Thanks for all the help, Tom

member_7f5b971d37 30 Aug 2026 #5

> member_d309c3a090 wrote: > Another question: How did your partners react? Did they love it right from the start, or did their interest grow over time? I only briefly mentioned it to my partner last night. She wasn’t grossed out by it, but she didn’t look overly enthusiastic either. Hopefully, she’ll enjoy it as much as I think I will. It’s easy to judge from afar because many of us (myself included) made mistakes when introducing MC into our relationships. Before you commit and order a device, have a long chat with your partner about what chastity is all about. Suggest some online reading material for her. Books like "The Keyholder's Guide" or Sarah Jameson’s "Be Careful What You Wish For" can be very useful. Be ready to answer questions regarding why you want this, how it benefits your relationship, and what’s in it for her. Some women find the concept of MC a bit hard to grasp. Once she has read up on things and understands your proposal better, involve her in searching online for the right device together. Letting her handle the ordering helps encourage her sense of ownership over both the device and eventually your chastity. If you only educate yourself, order quietly behind her back, then present it to her expecting a good keyholder role without much explanation, there’s a high chance it won’t work out well. Trust me, I’ve been through that myself. Take your time; rushing isn't necessary. Your efforts will likely be rewarded.

member_56a3d51043 31 Aug 2026 #6

> member_7f5b971d37 wrote: > If you only educate yourself, order quietly behind her back, then present it to her expecting a good keyholder role without much explanation, there’s a high chance it won’t work out well. Trust me, I’ve been through that myself. Guilty as charged! Fortunately (for both of us now;)), things worked out in the end, even though we had a rocky beginning. I’ll never forget that day: she started rubbing my groin and realized there was something harder than just my dick down there.:shock:

member_d309c3a090 1 Sept 2026 #7

> Before you commit and order a device, have a long chat with your partner about what chastity is all about. Suggest some online reading material for her. Books like "The Keyholder's Guide" or Sarah Jameson’s "Be Careful What You Wish For" can be very useful. Thank you again for being so helpful; I am truly grateful. Regarding "the key holders guide", could you tell me the author's name? There are several books with similar titles floating around. Also, is "Be careful what you wish for" worth the cost? The only version I’ve found online costs $65, which seems like a lot for an eBook. However, if it truly helps, I wouldn’t mind paying that amount. One more question about measurements: Should I measure bone-pressed? Or from the underside? Essentially, my initial measurement is taken along the top of the penis. If I start measuring from my balls instead, the number comes out a bit smaller. Thanks everyone.

member_75c78a1ec7 3 Sept 2026 #8

> member_d309c3a090 wrote: The Curve will be quite loose as you mentioned. Do you think the CB6000 feels really tight or just snug? I probably won't be conditioned to wear it super tightly. If my calculations are correct, your diameter should be around 1 1/4 inches. The CB6000 is 1 3/8 inches wide. This offers a better fit than the Curve, which measures at 1 7/16 inches. It will likely feel snug when you first start wearing it. Excitement levels might be your biggest challenge. To help insert the penis into the tube during installation, try the "stocking method". It’s a technique that makes putting on the device easier. You can find instructions here ... ng-method/

member_d309c3a090 4 Sept 2026 #9

Thanks locked by LRC:-) Thank you for taking the time to calculate that for me; I was struggling with it. That link will surely be very useful. Thanks again.

member_56a3d51043 5 Sept 2026 #10

> member_d309c3a04 wrote: > Regarding "the key holders guide", could you tell me the author's name? There are several books with similar titles floating around. > Also, is "Be careful what you wish for" worth the cost? I gave this book to my wife (who was quite vanilla) when we began. It helped articulate many of the things I was trying to express verbally. ... 1905605145 As for Sarah's "Be Careful What You Wish For", it is indeed pricey. I’ll admit I own a copy, but I didn’t pay full price since I bought it when she first started gaining popularity. My wife hasn’t really looked at hers much; some parts probably wouldn't have appealed to her back then. In my opinion, start with Lucy's book and see what conversations arise from reading it.

member_1291e5bb78 7 Sept 2026 #11

Hi Tom, When my partner and I started chastity, we purchased an inexpensive CB6000 clone on eBay for under £20. We later upgraded to a spiral clone that has served us well. Recently acquired a Prince Albert as well, and now live in a second-hand custom Tube from the marketplace forum here. I suggest browsing eBay thoroughly; you can find most devices there and pick one whose look appeals to you. I’d also recommend choosing options with multiple ring sizes so you can determine what feels comfortable for your body type. That’s my two cents as someone relatively new! M