Random historical sex fact. Psychiatrist James Giannani did research about foot fetish through the ages. He found some strange pattern. Sexualization of female foot can be see to spike during STD epidemics (for example gonorrhea in 13th century, syphilis in 16th and 19th centuries, AIDS in the late 20th century.) After the outbreak, the interest would be reduced. When it's dangerous to have genital sexual intercourse, foot play can be a safe and healthy substitution. So, foot fetish may have been developed as an evolutionary useful mean to still have benefits of sexuality during STD epidemics.
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