Scientists believe they have discovered the difference between love and lust.
Researchers said lust triggers activity in part of the brain which controls pleasure while love activates the region which gives that pleasure meaning - and includes addiction.
Pyschologists analysed 20 previous studies of brain activity as subjects viewed erotic pictures or photos of their partners.
Professor Jim Pfaus of Concordia University in Montreal, Canada said: “While sexual desire has a very specific goal, love is more complex.”
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