O rings - confusion

Hi

Me and the OH have just bought these:

https://www.lovehoney.co.uk/product.cfm?p=32780

Found the harnesses etc a bit fiddly and this just seems much easier. It has a 1.5" O-Ring and we have found a couple of compatible dildos on here.

But I am keen to try some others where the O-ring size is 2 inches for instance.

So questions are:

- does the O-ring have to fit exactly or can it be out

- I've seen a set of interchangeable o-rings, does anybody know how easy it is to swap over on the shorts?

I've not got these shorts but can still answer Q1, as have experience of other products, and that is that you're Ok to go for a dildo with a smaller girth than the ring - it doesn't need to be an exact fit, what extra movement you do get from a larger ring than dildo is minor tbh.

You will find it difficult to change the o ring because of how it is stitched into the shorts. I don’t have these shorts but i do have similar. I have found that the lifelike lover range of dildo’s with a 2” o ring size, will fit in the 1.5” o ring without being loose and allowing movement by slipping the suction cup part through the hole.

The o ring size on some dildos is smaller than the o ring when in place so you have some movement as Sum Sub says, movement is minimal when being worn but it caused me confusion as well initially thinking i had something wrong.