Matthew 12:31: Wherefore I say unto you, All manner of sin and blasphemy shall be forgiven unto men: but the blasphemy against the Holy Ghost shall not be forgiven unto men.
God can and does forgive sexual sin when it is confessed and forsaken.
Proverbs 28:13: He that covereth his sins shall not prosper: but whoso confesseth and forsaketh them shall have mercy.
Hebrews 13:4: Marriage is honourable in all, and the bed undefiled: but whoremongers and adulterers God will judge.
Galatians5:19: Now the works of the flesh are manifest, which are these; Adultery, fornication, uncleanness, lasciviousness, 20 Idolatry, witchcraft, hatred, variance, emulations, wrath, strife, seditions, heresies, 21 Envyings, murders, drunkenness, revellings, and such like: of the which I tell you before, as I have also told you in time past, that they which do such things shall not inherit the kingdom of God. 22 But the fruit of the Spirit is love, joy, peace, longsuffering, gentleness, goodness, faith, 23 Meekness, temperance: against such there is no law.
Colossians 3:5: Mortify therefore your members which are upon the earth; fornication, uncleanness, inordinate affection, evil concupiscence, and covetousness, which is idolatry:
When I was in the military a friend who was a few years older than me shared with me that the intimacy he had with his wife before they were married ruined their marriage. Their intimacy after the marriage was not as special as it would have been had they waited. He had convinced her to violate her own conscience and that was a barrier between them ever after. They were divorced. He still loved her and was broken-hearted. I was not saved at the time, don*t know if the man was a Christian and I never met his ex-wife since they lived in a different state than I did. I pray that if they weren*t saved that by now they are.
For another man who had been promiscuous before his marriage, his wife came in second best to several of his partners in sin when it came to intimacy. For about 20 years and counting he had what he thought was a second-best wife. Rather sad. I am certain that he was not saved and don*t know about his wife. I believe that extra-marital intimacy has the same negative results as premarital intimacy. I also believe that it has the same negative impact on the women that it does on the men.
The main cause of divorce is a lack of commitment. People marry with the idea that *if it doesn*t work out we can get a divorce.* Living together before marriage is a lack of commitment.
I heard of a young man who told the father of his young lady friend that he wanted to marry her and promised that their first kiss would be at their wedding. What a great promise!!!
Matthew 19:6: Wherefore they are no more twain, but one flesh. What therefore God hath joined together, let not man put asunder.
1 Corinthians 6:18: Flee fornication. Every sin that a man doeth is without the body; but he that committeth fornication sinneth against his own body.
Another young man I met in the military shared wisdom with me that he got from his father. Though I never met his parents, I am convinced they were all believers. I would estimate his parents had been married about 30 years. He had an older sister. His father told him that his parents* intimacy got better and better. Isn*t that the way you want it? And, more importantly, isn*t that the way God wants it?