Originally Posted by jackdavinci
I was under the impression that it was an issue of mobility and that the only point of a jock strap was to hold a cup. Do athletes wear jocks without cups?
Some do... Sprinters, for instance, don't need the protection of a cup, but do benefit from having support of the testes.
ETA: ever watch a nude guy sprint? It looks terrifically painful! It doesn't take an engineer to spot the obvious "most likely mode of failure."