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The secret behind passionate kisses revealed

February 6, 2009
'Ummmms' and 'aaahhhs' are not the only co-partners of kissing, for a passionate lip-lock unleashes a chain of chemical changes that really turn your head, claims a new study.

As Valentine's Day approaches, Wendy Hill, professor of psychology at Lafayette College, Pennsylvania has taken the opportunity to shed light on that most basic of all human expressions of love -- the smooch.

Text: ANI | Photograph: Vladimir Sindeyev/Reuters

Also see: 'Is masturbation harmful?' Misconceptions about sex

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