What does a Christian husband do if his wife refuses to have sex with him for 8 months to a year or more at a time for the last 18 years -- even though the husband has done his best to plead and remedy the situation on his part but to no avail? Escort service has been the only remedy so that divorce would be averted for the kid's sake. Society has a tendency to blame the man for cheating and affairs when it just might be the woman a lot of the time who is the instigator and culprit. In today's rapidly decaying society the wife is increasingly becoming very rebellious in the marriage, being very selfish to her husband's needs. It's not right, especially when the husband is giving, kind, and supportive of the family.
A Christian husband would never consider adultery with prostitutes as a "remedy" to anything. One person's sin does not justify sin by another.
"Do you not know that the unrighteous will not inherit the kingdom of God? Do not be deceived. Neither fornicators, nor idolaters, nor adulterers, nor homosexuals, nor sodomites, nor thieves, nor covetous, nor drunkards, nor revilers, nor extortioners will inherit the kingdom of God. ... Do you not know that your bodies are members of Christ? Shall I then take the members of Christ and make them members of a harlot? Certainly not! Or do you not know that he who is joined to a harlot is one body with her? For "the two," He says, "shall become one flesh." But he who is joined to the Lord is one spirit with Him. Flee sexual immorality. Every sin that a man does is outside the body, but he who commits sexual immorality sins against his own body. Or do you not know that your body is the temple of the Holy Spirit who is in you, whom you have from God, and you are not your own? For you were bought at a price; therefore glorify God in your body and in your spirit, which are God's" (I Corinthians 6:9-10, 15-20).
I'm sorry that your wife is not fulfilling her duties (I Corinthians 7:1-5). But this is the woman you married. Perhaps you two can find a counselor to help resolve the issues. Or she might need to see a doctor in order to determine if there is something physically wrong with her desire for sex. However, you need to stop justifying your sins and live righteously before God, else you might not make it to heaven.