Meaning: Male sexual activities before or outside of marriage that may have resulted in illegitmate children.
Isaiah 5:2
And he fenced it, and gathered out the stones thereof, and planted it with the choicest vine, and built a tower in the midst of it, and also made a winepress therein: and he looked that it should bring forth grapes, and it brought forth wild grapes.
Matthew 13:25-27
But while men slept, his enemy came and sowed tares among the wheat, and went his way. [26] But when the blade was sprung up, and brought forth fruit, then appeared the tares also. [27] So the servants of the householder came and said unto him, Sir, didst not thou sow good seed in thy field? from whence then hath it tares?