Why guys treat you like a sex object
Many women are very unhappy with the opposite sex because men seem to treat them like sex objects. Instead of listening to what women have to say, they stare at a woman's lips, chest and other areas of her body. Instead of talking to a woman seriously, a man might start joking and flirting with her as if she was his date or a little girl.
Being treated like a sex object naturally happens more to the more physically attractive women and can indeed be annoying and frustrating especially when a woman is trying to assert herself as an highly educated, intelligent and successful individual.
So, what you can do about it and should you do anything about men's behavior toward you? Well, you have two options. The first one is to try to fight men's perception of you by calling men on their behavior, raising your "shields" when you are out in a social environment, and otherwise making yourself appear as a tougher woman. This, however, will hardly achieve any positive results. For obvious reasons, you cannot change men and the way they are. By becoming a "tougher" woman you are likely to hurt yourself more than help yourself. Having an antogonistic mindset toward men can be an substantial social obstacle. It's easy to spot a woman who is "angry" at men and not too many people want to work with such a woman or socialize with her.
A much better and wiser approach is accepting and understanding men's nature. It is very important that you accept this extremely powerful male drive to perceive women as sexual objects first, before they see anything else in a female. No one should tolerate discrespectful, unduly suggestive, unwelcome behavior, and you shouldn't be putting up with harassment or degrading sexual comments from men. However, knowing and truly accepting the fact that you are a sexual object to men first , that it's absolutely natural and normal for men to perceive you as such, and that it is actually a compliment to you, is crucial to your understanding men and being able to get along with individual members of the opposite sex as well as the male kind overall.
It so happens that women who understand men on that "guys" level get much more respect and come across as much more attractive and desirable women for dating and relationships that those women who are uptight and attempt to make men feel guilty about who they are and what they naturally desire.