My view is that the Old Testament is much better than the New Testament. Jesus was totally wrong to equate feelings with actions. The Old Testament focuses on the ACT of adultery, which means sex with another man's wife. This is the only real sexual sin for men. You can read the Old Testament view in
Proverbs 5 to 7. I particularly like Proverbs 6:26 which clearly says that a prostitute is fine but another man's wife is off limits.