Synonyms and related words :
adulterous affair, adultery, affair, amour, concubinage, criminal conversation, entanglement, eternal triangle, extracurricular sex, extramarital relations, flirtation, forbidden love, fornication, free love, free-lovism, hanky-panky, illicit love, incest, infidelity, intrigue, liaison, love affair, premarital relations, premarital sex, romance, romantic tie, triangle, unfaithfulness,