Intelligence. What is it? What does it mean? Why is it such an attractive quality in the opposite sex?
capacity for learning, reasoning, understanding, and similar forms of mental activity; aptitude in grasping truths,relationships, facts, meanings, etc.
Does this definition excite anyone else?! Intelligent people are the people that "get it". The people that can learn, comprehend and grasp high-level information, as well as detailed information. They are often the people in class that get bonus marks for including too much detail or the people that understand what is being talked about when the speaker has barely even skimmed the surface of the topic.
I believe that one key to intelligence is being receptive to the world around oneself. Not that the person picks up on every subtle hint others throw their way, but that they actively engage in the world. In order to "grasp truths, relationships, facts, meanings" I believe there would need to be a conscious effort to be present in interactions with others. This can be in a classroom setting by listening, taking notes, etc. This can be in a friendship/relationship/family setting by focusing on the person and the conversation, rather than being distracted by other things in the room.
This is attractive in someone of the opposite sex because it shows that they take information in, mull it around, and form rational conclusions in their mind. In essence, they think. Because of the time spent thinking and forming conclusions, they have opinions. Opinions make for interesting conversation. Now, not everyone's opinion is necessarily intelligent. However, you can spot those individuals right away, because when they start to share their opinion, they have nothing to back it up. Intelligent persons will have solid, rational information to back up their thought process, or will at least be transparent about how they've formed the conclusions they have, in order to possibly gain insight from others about it.
Those that are engaged in conversations are the most attractive. Not only does it show intelligence - to me, it shows they care.