Why do women have a problem being sex objects?

Don't they realize that if the opposite gender wasn't ever seen as a sex object, there would be no sex, or children? I would understand being upset about ONLY being seen as a sex object, but so many act like it is never okay to see the opposite gender as a sex object. This seems completely unreasonable to me, that they don't recognize there is a healthy middle ground.
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Women are the ones using the term "sex object" any time a guy is attracted to a woman he doesn't know on a personal level. That is why I decided to use that term. I also put both genders in the same category.
Why do women have a problem being sex objects?
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