Synonyms for Coition:

n.

carnal knowledge (noun)
sexual congress, sex act, sexual relation.
coition (noun)
copulation, coitus, relation, sexual relation, carnal knowledge, sexual intercourse, sexual congress, sex act, congress.
fornication (noun)
coitus, copulation.
intercourse (noun)
carnal knowledge.
lovemaking (noun)
sexual intercourse.

Other synonyms:

Other relevant words:
coitus.