I've just finished Why Him, Why Her by Helen Fisher.
> born 1945
> anthropology professor, human behavior researcher at Rutgers University, studied romantic interpersonal attraction for over 30 years
> currently the most referenced scholar in the love research community
More than with parts about love, my attention was attracted with her view of personality types division.
Fisher distinguishes between four personality types each of which she associates with a body chemical :
> explorer (artistic, Artisan temperament) - dopamine (associated with curiosity and spontaneity)
> negotiator (intuitive, Idealist) - estrogen (intuition and creativity)
> director (reasoning, Rational) - testosterone (independence and rational thinking)
> builder (sensible, Guardian) - serotonin (sociability and feelings of calm)
Without taking a test I can undoubtedly admit that I am an almost 100% director (I was thinking a while about explorer too, but this is probably because I am jealous of explorers' traits ;).