(The Local) Rather than making men look out for a new woman, the hormone oxytocin, known for its importance in bonding between romantic partners, seemed to steer those already in a relationship away from a potential rival, the researchers found.

But not all men reacted the same way. “For the singles, there was no significant effect,” Dirk Scheele from the University of Bonn’s Department of Psychiatry, told The Local.

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