Curved ring is the ONLY way I can enjoy prolonged chastity. Otherwise it pinches so uncomfortably/painfully under my balls and I can’t bear it. A bit of discomfort in chastity is kinda part of the fun (I love to strain in my cage when the mood strikes) but pain and severe discomfort isn’t worth it.
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Also, may allow more mobility imo. From doing squats to riding the horse machines in the arcade- did all of them. Felt like there wasn't anything :D