Sometime in ritual done by touching or kissing - both feet, both knees, womb, both breasts, and the lips
"Blessed be thy feet, that have brought thee in these ways.
Blessed be thy knees, that shall kneel at the sacred altar.
Blessed be thy womb, without which we would not be.
Blessed be thy breasts, formed in beauty.
Blessed be thy lips, that shall utter the Sacred Names."
This is where a lot of Wiccan get the term Blessed Be as a greeting.