I'm not an antropological biologist myself and can't judge the validity of her findings. But it sounds pretty interesting to me:
"Fisher has looked at marriage and divorce in 58 societies, adultery in 42 cultures, patterns of monogamy and desertion in birds and mammals, and gender differences in the brain and behavior. In her newest work, she reports on four biologically-based personality types, and using data on 28,000 people collected on the dating site Chemistry.com, she explores who you are and why you are chemically drawn to some types more than others."
(This is from her own webpage Dr Helen Fisher - Biological Anthropologist - Home Page. I didn't search for peer criticism of her hormonal theory. But it would be interesting to see it disputed.)