- Kissing has many documented benefits, including helping reduce tooth decay through increased saliva production and lowering stress levels. - The world's longest kiss took place in 2002 and lasted over 30 hours. - In medieval Italy, public displays of affection like kissing could result in the couple being forced to marry. - Different astrological signs are said to have characteristic styles of kissing, from quick and passionate for Aries to lingering and intimate for Taurus.