The use of the letter X as a symbol of affection can be traced
back to when the illiterate would sign contracts with an X in
place of a signature. Marked in the presence of witnesses, it
was followed by a kiss upon the X to further convey sincerity.
If one’s mind is on calories whilst kidding, there can be no
hope for love. However, it is known that some have a penchant
for such inanities, so: the energy used in a kiss is of course,
totally dependent upon one’s depth of passion but a general
estimate given is between 2-6 calories a minute. A kiss conveys
subconscious information about the genetic compatibility of a
prospective mate. Research has proven that women prefer men with
immune system proteins that are different from their own.
Scientists believe that a woman may be able to smell these
proteins while kissing and that what she smells may affect
whether she finds her partner attractive. Kissing, according to
the Gordon G. Gallups at Albany State University, New York,
involves a very complicated exchange