Perhaps couples that think having a baby will fix their relationship
should have their hormone levels tested instead.
Judy Ritchie

http://news.bbc.co.uk/2/hi/health/4669104.stm

Sex chemistry 'lasts two years' 

Certain hormones are active during the 'acute love' phase
Couples should not worry when the first flush of passion dims - scientists
have identified the hormone changes which cause the switch from lust to
cuddles. 
It is suggesting that what happens first is the best bit - and that isn't
true 
.....
Dr Petra Boynton, British Psychological Society
Levels of these chemical messengers were much higher in those who were in
the early stages of romance. 
Testosterone was also found to increase in love-struck women, but to reduce
in men when they are in love. 
But in people who had been with their partners for between one and two years
these so-called "love molecules" had gone, even though the relationship had
survived. 
The scientists found that the lust molecule was replaced by the so-called
"cuddle hormone" - oxytocin - in couples who had been together for several
years. 
Oxytocin, is a chemical that induces labour and milk-production in new and
pregnant mothers. 
Donatella Marazziti, who led the research team, said: "If lovers swear their
feelings to be ever-lasting, the hormones tell a different story." 
Similar research conducted by Enzo Emanuele at the University of Pavia found
that levels of a chemical messenger called nerve growth factor (NGF)
increased with romantic intensity. 
After one to two years, NGF levels had reduced to normal.

Michael Odent quoted on oxytocin
http://www.mercola.com/2003/apr/9/child_care.htm

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