YouTube channel LolPervs recently featured an experiment in which a collection of very tolerant men are asked to guess what a menstrual cup (it’s actually a foldable one, a LilyCup) might be.
None of them guess correctly, although most of them cotton on that it’s something to do with a female body. One of the guys wears them as earrings – which look quite good in an early 1990s way, actually.
A writeup in Cosmopolitan:
The original youtube video: