What are benefits of O-ring attachment for different accessories?

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I've noticed a lot of different accessories, especially harnesses for intimate wear, come with an O-ring attachment. I'm curious about the specific advantages that O-ring design offers compared to other types of loops or fasteners for connecting items. Does it provide better flexibility, security, or perhaps more compatibility with a wider range of toys and attachments? Any insights into why this particular design is so popular in these kinds of products would be really helpful!