(an instance of) voluntary sexual intercourse of a married person with a person to whom he or she is not married

extramarital affair

wax made by bees, as used for polishing wood

personal concern

a foolish behaviour; a foolish act, idea or word

shenanigans

(an act of) criminal dishonesty; a person who pretends to be qualified, to have authority or to want to be kind, but who is or does not

trickery, deception

any flat figure that has three straight sides

love relationship