I get quite a few complaints from men whose wives have locked them up in a chastity device (and some who haven't) concerning orgasm control. These men want to know exactly what constitutes “Orgasm Denial” and what is just plain sexual denial.
Ladies, ladies, ladies! If you are not teasing your partner at least once a day (hopefully a great deal more) then you will never achieve what you are looking for. Your man will eventually stop doing as he is told and will become disillusioned at the least, possibly even bitter about it.
Sexual denial is never going to improve your marriage, or your husband's behavior. If your goal is to mold him into the man you want him to be, then you have to tease him and tease him and tease him some more. That's all there is to it.
In my experience, you should be teasing your guy for at least 30 minutes a day. It doesn't matter whether you give him that all at once or break it down into several shorter teases, but you must tease him every day. You need to use him to please you, if nothing else. That alone will give him what he needs even if you do nothing else.
Personally, I recommend teasing him for five minutes or so several times a day. You must talk to him, erotically, that is. Get his cock hard. If he is in a chastity device and can't get hard, at least make his cock strain against its confines. If you can do this several times each day, then you are no longer just denying him sex.
Once or twice a week you should spend at least an hour getting him sexually aroused. Talk to him, stroke his body. Tease his nipples, balls and anus. Use some kind of instrument, a toothpick, a feather, a fine brush, to tease his body until he is fully aroused (mentally if not physically).
At least once a month, remove his chastity device (bind his hands so that he can't touch himself) and tease his cock until he is begging for that orgasm you have denied him. You can either let him have it, ruin it, or just plain deny it for another day, week, month, or whatever length of time you like. Make it fun for you. If you enjoy doing it, then you will be more likely to continue doing it instead of ignoring the fact that your partner needs sexual attention.
If you are one of those who doesn't want to use a chastity device, be prepared for him to masturbate. It's will happen. In spite of what he tells you. But if you can make it more interesting for him, say with a little humiliation? Then you may not need that chastity device. Try making him masturbate while you watch. Do it several times a week and you may get his unauthorized masturbation under control.
In short, make sure that you are denying him orgasms and not just denying sex. Sorry to have to tell you this, ladies, but if you simply deny him sex, he will get it elsewhere, even if it's only his own hand.