Where did the mistletoe custom originate? Among the ancients, because mistletoe was considered sacred to the sun, it was used at the December festival of the winter solstice, when the sun was lowest in the noon sky.
Kissing under the mistletoe was thought to be an act of solar worship, empowering the worshipers for still further worship. As this indicates, pagan sun-worship services were very licentious. Temple prostitution was performed during the eight-day Roman Saturnalia which immediately preceded the December 25 sun-birth celebration.
Christmas, Easter, and Halloween
by Vance Ferrell