comment: >
  
  That's not what "necessary" means
  Just because a huge portion of the US population eats, IDK, ice cream and donuts, doesn't mean they are "necessary" 
  Just because a huge portion of the US population wears "Supreme" branded clothing that costs $250 for a shirt or whatever doesn't mean "Supreme" brand clothing is "necessary"
  You get the point. Necessary means "required to function" - a fly is certainly not "necessary" just because some people use it
context: I’m shocked that 50% of people said they use the fly. >
  
  So was I. Anecdotal obviously, but ask your close male friends and I bet you'll be surprised at the split >
  
  
  The "Fly"...is Totally Unnecessary  
  it's surprisingly split almost 50-50 between those who use the fly to snake their thing through to urinate and those that just flop it over the top.
  
  You just immediately showed that it's not unnecessary, that a portion of the customer base uses it (and it's not hindering those that choose not to use it)
  Personally, I go over the top if my pants are elastic but if I'm going through the fly of the pants, I go through the fly of the undies too