Does Sexual Chemistry Last?
February 23, 2006
Italian scientists have determined that the changes to body chemistry which causes people to find new partners sexually attractive lasts, at most, two years.
At that point, couples shift into a "stable relationship" period, and other hormones dominate.
Hormones called neutrophins were present in much greater quantities in the blood of those in the early stages of a relationship. Testosterone also increased in women and decreased in men during this period.
This changed in those who had been in a relationship between one and two years; the "lust molecule" neutrophins were replaced by oxytocin, the so-called "cuddle hormone".
Some researchers were concerned that people might feel obligated to take hormone supplements in order to re-experience the initial rush of lust.