To me, there is something incredibly hot about a guy in a hard cup jockstrap. It’s a form of chastity, in my view:
The first shot above is from Naked Kombat.
The second image is from Jockstrap Central — where you can purchase a hard cup for yourself.
Some of the vintage metal ones are hot — and highly collectible.
They used to make a clear one as well. If I knew how to mold plastics, I’d start making some.