IF I WERE TO RECEIVE JESUS TODAY, I WOULD RECEIVE HIM ON TONGUE AND KNEELING! From Our Lady according to "Pachi" a Young Visionary from Ecuador. Reference: The 101 Foundation Newsletter Volume 4. No.2 Summer, 1992 USA.
Subconscious and innate psychological mechanisms discourage Communion in the hand
In the first weeks of a baby's life are built and defined the primary psychological mechanisms, which are the most important for the physical and emotional survival of people. From there everything else part.
Since we were babies our mind used hand to manipulate reality around us, to pick up objects, toys, food, etc.. And later for handling all instruments and money everyday, etc.