After that I introduced her to Teasing and Denial. We agreed to two sex nights a week with one being just teasing for me. She liked T&D and that led to longer and longer denial periods. That is when I showed her a picture of the CB6000 and told her that I needed a little help avoiding masturbation for the time periods she wanted to deny me. So I ordered it. She had no problem with me wearing it but I held the key at first. I was constantly fiddling with spacers and rings and she was getting annoyed when I asked her for the keys several times a day. Once I got a good fit she tool the key. So we did chastity for a while before my wife was even aware of chastity devices. That helped a lot. Sort of like when we started BDSM. I did not hand her a whip and ask her to use it on me. We started with just some spanking and moved on to an arsenal of whips over the years.
I started to act like I though I should from reading all those benefits for the wife. Truth is that I was a very good husband even without chastity and my wife did not want me to be even nicer because she was cock teasing me, as she put it. She does not want a submissive husband so we do not do much in the D/s department. Most I do is massage her when she asks and make her a cup of coffee each night and do the dishes after dinner. That is it. She asks me and never tells me to do things. She told me that I was smothering her with love and attention and so I just went back to being me. I sometimes wonder if guys who try chastity do all the thing listed as benefits to their wives because of the chastity or because they feel that they should act that way.
I never recommend that you go with a device unless your wife is aware and approves it. The fact that you are asking her to deny you orgsams is overwhelming enough without handing her some plastic gadget too. For us, easing into it via Teasing and Denial play and on the honor system first, worked. We approached it like we did BDSM, baby steps and getting used to it gradually. Good luck but do not give up. I have never had a lover who I could not get into my fetishes. It just takes time and the right approach. Like I said, you cannot just hand them a whip ask them to beat you to tears.
Same with chastity. All sorts of thoughts go through a wife's head. Maybe I do not find her attractive anymore or do not find her sexy. Maybe I no longer am interested in sex with females. They think of all these things because why in the world would their husband want to be denied the one thing that guys are always asking women to give them. What is wrong with you. I also present my fetishes as a sex game and make sure that they treat it that way and not a way of life, even if we do it for 40 years. Just talk to your wife. My wife does not like talking about sex so we too use emails. Like Tom suggested, books help. I gifted my wife two Chastity ebooks by Georgia Ivey Green. They were very helpful to her. Two years later and we are still changing things. It has to be fun for both or not worth it. The big issue now is that my wife feels that although chastity resulted in much fewer orgasms for me, it has greatly increased the number of times we want sex and she only is in the mood once or twice a month. So now she just has me edge myself for 5 minutes instead of the whole process of getting ready for sex in bed with the makeup and perfume and lingerie, etc.. Now she just tells me to drop my pants and make myself hard. Five minutes later I am locked up again. She likes that much better. We are old so we do not have sex twice a night like we used to when we were having sex as a couple. Keep trying and there is good info out there but you need to filter out the masturbation fodder.