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Why would they be a bigger circumference than a diva cup? The circumference of a diva cup matches that of the figure on the left.
The female condom has two rigid rings, one in the sealed end that sits under the cervix, and one at the open end.
The ring at the open end is designed to hold the condom open and give the penetrating partner a nice big safe target to make sure the penis/toy/whatever goes inside the condom and not accidentally between the condom and the vaginal wall. This ring also provides some minor protection to parts of the vulva due to its size.
The internal ring is much smaller by comparison, and is not that much larger than a diva cup. The internal ring of a female condom is a similar size to a “soft cup” menstrual cup, it’s a little bit smaller than a contraceptive diaphragm.
If they were the size of a penis it would just be the male condom with extra steps.