They're called "compression" shorts and youy wear them under your regular rugby shorts. You can get them at any decently stocked sporting goods store.
U wear spanks under rugby shorts there spandex shorts u can get ones that just cover ure *** or go down to ure knees its ure choice
The article of clothing your are talking about are compression shorts man. They are essentially short versions of Under-Armour, they price from about $8-20 depending on the brand. They go under your shorts and will protect your jewels to a degree.