1 Corinthians 6:16-19 What? know ye not that he which is joined to an harlot is one body? for two, saith he, shall be one flesh. But he that is joined unto the Lord is one spirit. Flee fornication. Every sin that a man doeth is without the body; but he that committeth fornication sinneth against his own body. What? know ye not that your body is the temple of the Holy Ghost which is in you, which ye have of God, and ye are not your own?
1 Corinthians 5:1 It is reported commonly that there is fornication among you, and such fornication as is not so much as named among the Gentiles, that one should have his father's wife.
1 Corinthians 5:2 And ye are puffed up, and have not rather mourned, that he that hath done this deed might be taken away from among you.
1 Corinthians 5:3 For I verily, as absent in body, but present in spirit, have judged already, as though I were present, concerning him that hath so done this deed,
Jude 1:7 Even as Sodom and Gomorrha, and the cities about them in like manner, giving themselves over to fornication, and going after strange flesh, are set forth for an example, suffering the vengeance of eternal fire.
Jude 1:8 Likewise also these filthy dreamers defile the flesh, despise dominion, and speak evil of dignities.
Love can be tough...
Hebrews 12:6 For whom the Lord loveth he chasteneth, and scourgeth every son whom he receiveth.
Hebrews 12:7 If ye endure chastening, God dealeth with you as with sons; for what son is he whom the father chasteneth not?
Hebrews 12:8 But if ye be without chastisement, whereof all are partakers, then are ye batards, and not sons.