Ultimately, the conclusion is left to the individual. One should also remember that sin is sin and any sin can be confessed and forgiven. Furthermore one can be also cleansed from all unrighteousness. God said that it was not good for man to live alone. Masturbation does not promote companionship.
Masturbation prohibits procreation.
The husband was to be head of the home and care for the wife. Therefore as the church is subject unto Christ, so let the wives be to their own husbands in every thing. Masturbation is self-centered. Nevertheless, to avoid fornication, let every man have his own wife, and let every woman have her own husband. Masturbation brings self gratification.