zips

ok so here's one question that i've been pondering over for sometime now:

why do girls' jeans have zippers?

no, seriously, why? i mean, i can imagine the very first time that women started wearing jeans. at that time, jeans were probably manufactured just for men and the zipper was obviously present out of sheer necessity. and the women just started wearing them. this far, it makes sense. but today, with manufacturers making jeans especially for women, with the body-hugging tight-fitting ready-to-rip-open-any-moment-now shapes and everything, which obviously are not designed for omnisexual use, why do they still come with zippers?

is there some mysterious purpose that is served by these seemingly unnecessary metallic attachments, unbeknownst to me? in my opinion, all they do is cause annoyance when they inevitably get stuck from time to time.

and it's not like jeans *must* have them, right? it's not like not having them would leave gaping holes in the wrong places because i'm sure the designers of this era are not so dumb as to be unable to come up with creative ways of covering up the holes that are left behind.

girls, you wanna enlighten me on this one?

this is probably a more appropriate post for the "questions without answers" blog.