Human partnerships

From the NY Times article today on why men get married, then after a number of years, their gay identity emerges and they leave their wives for other men - the 'Brokeback Marriage'.

"Helen Fisher, a research anthropologist at Rutgers University, said in an interview that human partnerships are shaped by three independent neurochemical brain-body systems, responsible respectively for sexual attraction, romantic yearning and long-term attachment.

"The three systems are very fickle. They can act together, or they can act separately," Dr. Fisher said. This, she said, helps explain why people can be wildly sexually attracted to those they have no romantic interest in, and romantically drawn to — or permanently attached to — people who hold no sexual interest.

"Once the system is triggered, it's so chemically powerful that you can easily overlook everything about that person that doesn't work for you," Dr. Fisher said. "Even straight people have fallen in love with people they could never make a life with," she said."