Okay, for one reason or another, you have decided not to keep your partner in chastity. That is, you are not going to make him wear a chastity device. Maybe you tried it and it chaffed him severely, or maybe you don't like having to remove and replace it each time you want to use his equipment, or maybe, you just want to torment him more that. How do handle your relationship when you don't put your guy in chastity?
In order to do it, you must keep a vigilant eye on him in order to be sure he isn't cheating. This is a difficult thing to do. After all, there will always be times when you simply can't watch him and he may be tempted to cheat. Frankly, this doesn't always work out so well. You could try teasing him by making him masturbate several times a day. The idea is to keep him satisfied so that he won't be tempted to take things into his own hands.
There are several ways you work this, if this is the method you choose. For example, you can call (or text) him in the middle of the day (even when he is at work), and have him go to the nearest restroom and masturbate. Naturally, you need to have him send you photographic proof that he did as you ordered him to do.
In addition, you might have him masturbate for you at home once (or even twice) each night. This will serve to keep his desire to masturbate low. You don't have to even watch him do it. Simply tell him to go the bedroom or bathroom and do it. Have him bring you proof that he has complied with your order, and that is that. Personally, I have drink that proof as soon as I saw it, but that's just me.
The best method I have found is supervised masturbation. By having him masturbate ONLY under your supervision, can work to keep him from cheating. First of all, he has something to look forward to, i.e. masturbating under your watchful eye. Men who enjoy being humiliated (there are a LOT of them), will remain chaste in order to suffer the humiliation of being “forced” to masturbate. You can spend the time talking to him about your day, or what he is doing, you can kibitz him, you can talk on the phone to your mother or girlfriend if you like. You can watch him, you can ignore him, you can tell him to hurry up, or to stroke it a certain way. As long as you are in the room with him, everything will be fine.
If using the supervised method, you can still tease and deny them because you will allow them to masturbate for you later. I recommend doing it at least once a day. There is no rule that says you can't do it yourself. That is, you can always make him (let him?) cum anytime you feel like it. You can stroke him, suck him, or even fuck him, that's how you want him to cum. Just be sure that you remind him that he is NOT to cum without your permission.