The research focused on oxytocin, also known as the "cuddle hormone", that helps forge bonds between loving couples and parents and children.
Studies have also shown raised oxytocin levels make people more trusting.
Scientists in Germany found squirting the hormone up men's noses had a distinct effect on those in committed relation- ships, and they kept a greater distance when encountering an attractive woman than men treated with an inactive "dummy" version of oxytocin.
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