When two people of the same sex are talking, touching is usually acceptable.  Close friends of the same gender will walk hand in hand or arm and arm.  This is the case for men and for women.

It is common to see pairs or groups of men holding hands, walking arm in arm or with arms around waists/shoulders, hugging, sitting with arms around each other or resting on each other’s thighs, etc.  This is less common, but still widely accepted, in the business community. 

Women, although less touchy, observe similar closeness with each other.

There is usually little to no touching between opposite genders during conversations.  This is not always the case, especially in urban areas and with members of the younger generation.