In this month's Psychology Today, Helen Fisher M.D. wrote an interesting article on The Law of Chemistry.
The premise of the article is that people fall into four broad biological types: Explorer, Builder, Negotiator and Director. The Explorer is novelty seeking, risk-taking, and curious. Builders are often social, traditional, orderly and cautious. Negotiators tend to be sympathetic, intuitive, verbal and flexible. The Director tends to be direct, decisive, focused, and analytical. Fisher's research and data find that we tend to be attracted to people who are biologically not like ourselves, perhaps to create more genetic variety in our offsprings. For example, An explorer would be attracted to a builder. This Fisher's blog entry pretty much summarized the article.
I took the test within the article. Not surprsingly, I am an EXPLORER director.