The roller coaster is X2 in Six Flags Magic Mountain in California. In So Cal there are a few major theme parks and each has a reputation.
Disney for the family
Magic Mountain for the rides
Universal for the sights
Knott's is affordable fun
X2 is an amazing coaster that has 3 axis movement and high G forces. It would make sense that the people with fragile bits are injured by what's basically a high speed centrifuge on rails.