Or, perhaps, they invent a reason not to accept the truth about what Paul is saying?
1 Corinthians 7:
1 Now concerning the things whereof ye wrote unto me: It is good for a man not to touch a woman. 2 Nevertheless, to avoid fornication, let every man have his own wife, and let every woman have her own husband. 3 Let the husband render unto the wife due benevolence: and likewise also the wife unto the husband. 4 The wife hath not power of her own body, but the husband: and likewise also the husband hath not power of his own body, but the wife. 5 Defraud ye not one the other, except it be with consent for a time, that ye may give yourselves to fasting and prayer; and come together again, that Satan tempt you not for your incontinency. 6 But I speak this by permission, and not of commandment. 7 For I would that all men were even as I myself. But every man hath his proper gift of God, one after this manner, and another after that. 8 I say therefore to the unmarried and widows, It is good for them if they abide even as I. 9 But if they cannot contain, let them marry: for it is better to marry than to burn.
Verses 2-5 go together - all or nothing. IF you are going to be married, THEN all of it applies.
Verse 6 is referring to the overall subject expressed by Paul in the verses before and after 2-5.
Even if not the direct commandment of God - is it not from the wisdom of God?
Otherwise, would God let Paul write/include it in Holy Scripture on a whim based on his own personal preference?
Yeah - go right ahead and 'neglect' your spouse - see how that works out for you...