Thinking about it, if indeed it has changed over time I wonder if it is because of a change in style and general tightness of pants. The through the fly method is much easier in relatively loose fitting slacks and more difficult in relatively tight jeans. As we've gone to more casual clothing that tends to fit more snugly (and as we've grown bigger tending to more snugly fill our clothes) I wonder if that would change habits.
When I wear slacks I am much more likely to go through the fly since opening everything wide makes it hard to keep your pants up. But with jeans they aren't going to go far.
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