Avery I agree that it is better if you can become master of your flesh with God's help rather than use an artificial means, but God doesn't love you any less if you use a physical means to overcome temptation. It is a matter of knowing your body and making a choice to follow what God wants us to do by any means possible. Overcoming masturbation is easy for some but for others the physiology of the way they are made creates a need for more dopamine than the average person and that makes it very hard to break the addiction. It is more than spiritual or mental for some people and they need something like a belt, to help them to get free. It also helps them avoid the guilt and shame they feel along the way to becoming free from the addiction.
This is very common with people who have ADHD, there is a physical drive to supply more dopamine to their brain as their body doesn't make enough. Some supply this need through dangerous activities or active sports and others do it through masturbation and other sexual activities which are not ok for Christians outside of marriage. A belt can help to overcome the addiction that often develops but at the same time increases the dopamine which helps the body to function better in those people before and during marriage.
A belt works well in marriage (with mutual consent) for some who have a great sex drive as it helps to control that drive so that their wife or husband doesn't feel like a piece of meat to be used instead of cherished, wooed and loved. I don't believe that as Christians however we should deprive eachother of our bodies for a long time, the Bible talks about this and that our bodies are not our own. The wife has authority of the body of the husband and the husband has authority over the body of the wife. It is supposed to be mutual love and giving of one's self, when that gets out of balance and one feels used then that is the time to dial things back a little bit until there is balance.
