My perspective, as a woman, you need to open up the door and tell her there is your open relationship and make sure you have all your things when you leave to have this wonderful open relationship with someone else.
You have to remember that sex with your wife will never be special again. You will be just one of the mini guys who is screwing her, but the only difference is that you will be helping her pay the bills at home. Which absolutely does not make you special.
I had a girlfriend who convinced her husband to be in an open relationship. And like most women who want this they are to have a few guys already lined up and ready to go as soon as the husband give the OK for that open relationship. My girlfriend said she had the best time in her life being in an open relationship, and even though she promised her husband that she would not neglect their marriage, that is exactly what she did. She got so caught up in being with other guys, that she pretty much alienated her husband. And with her husband started to get angry about it, that was the only way that she would come back to her husband and try to fix things in their marriage. Period
She was going on dates four times a week, but she would never go on dates where she was on her menstrual cycle or if she did not feel well and that was the time that she was spent with her husband. But one day her husband said she should close or they should close the marriage because it was not working for him. She started to think of her husband as being a weak man and she didn’t close the marriage, and she kept going up with other men. So one day when she came home, Her husband was gone. That was the only thing that brought her out of the fog of stupidity. That was the only time that she started worrying about her husband and caring about what he was feeling because he was no longer there for her abusive actions.
She came back home from work after not seeing her husband for about eight days, and saw the envelope on the table for separation and divorce. She found out where her husband was, and start to beg him to not leave her, and that she would never do this again, but it was too late and she lost everything.