Why Are All My Pants Chastity Pants?

This has been bugging me for years.  Especially when I find myself running to a restroom in a ... ahem ... hurry.  Why are all my pants built like Fort Knox?  The pair I'm wearing today have a double hook and eye

a zipper

and a button.

Add a belt and my pants are like the multiple locking system on the door of a New York apartment. NO ONE is breaking in!

Is this really necessary? Are men's pants made like this?  Why all the security? Really, my hips can keep a pair of pants from falling off me without much help.  If I need to make a quick change I am out of luck in this outfit.