It's not hard to tell when two people are in love. Maybe they're trying to hide it from the world, still they cannot conceal their inner excitement. Men will give themselves away by a certain excited trembling in the muscles of the lower jaw upon seeing their beloved. Women will often turn pale immediately of seeing their lover and then get slightly red in the face as their sweetheart draws near. ... This is the effect of physical closeness upon two people who are in love.
The Art Of Kissing: How To French Kiss Step By... by howtokissvideoscom
The origins of the kiss were studied in the early 20th century by natural historian Ernest Crawley. He wrote that kissing was "a universal expression in the social life of the higher civilizations of the feelings of affection, love (sexual, parental, and filial), and veneration." According to Crawley, touch is "the mother of the senses," and the kiss was a tactile and specialized form of intimate contact.