So the holy kiss is a greeting in the ancient middle East of Paul's day. Today in the western cultures it is a handshake. Physical contact as we are seeing in the modern churches today is not even considered proper by people of the world who have proper training. It seems, sinners have more sense of propriety than Christians who claim to be filled with the Holy Spirit. To touch someone and make physical contact with them does not show the genuineness of friendship.
Physical contact is provocative.
Many use this occasion as a means of gratifying a desire to touch the opposite sex with sexual implications in mind. Touching originated with sensitivity training devised by humanists to destroy the Christian moral value system. For 1,900 years of the church's 2,000 year history physical contact was never attempted in worship services of the church.