Girth is important when sizing a cock ring, especially when sizing
glans rings. And it can increase somewhat when we get excited. My
glans ring accepts a cock with 3.5 inches (9 cm) circumference.
That is the girth of my limp penis. But I'm a grower. When erect my
girth goes up to 5 inches (12.8 cm) - a 40% increase. It's not
surprising that my rings get tight when I'm excited. That works OK
with my heavy cock ring (like the one in the group icon). But my
narrow cock ring and my glans ring both cut in. Very painful. As they say, a certain level of pain gives pleasure.

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