Synonyms for Intercourse (same or very similar meaning)
WordNet sense 1 (communication between individuals):
social intercourseWordNet sense 2 (the act of sexual procreation between a man and a woman; the man's penis is inserted into the woman's vagina and excited until orgasm and ejaculation occur):
coitus, congress, relation, coition, congress, sexual intercourse, carnal knowledge, sex act, sexual congress, sexual relationFrom the ODE community, based on WordNetadd/edit