WordNet (r) 3.0 (2006):

social intercourse
    n 1: communication between individuals [syn: intercourse,
         social intercourse]

Moby Thesaurus II by Grady Ward, 1.0:

40 Moby Thesaurus words for "social intercourse":
   ESP, answer, collegiality, commerce, communication, communion,
   community, congress, connection, contact, conversation, converse,
   correspondence, dealing, dealings, exchange, fellowship,
   information, interaction, interchange, intercommunication,
   intercommunion, intercourse, interplay, linguistic intercourse,
   message, reply, response, social activity, social relations,
   speaking, speech, speech circuit, speech situation, talking,
   telepathy, touch, traffic, truck, two-way communication