I guess it is down to how you feel about used fanny and/or sloppy seconds. Some love it some don't. Do you like the thought of you sitting at home/ having a beer with your friends while your wife is spreading her legs for someone else? Could you cope with arriving home and hearing him servicing her in the bedroom then chatting with him afterwards? If you answered yes to those questions then you are a potential cuck and if you are prepared to take the risk, the risk being you lose her, go for it. Many have and many, most, have enjoyed it. I have had a lot of pleasure providing that enjoyment for several cucks. Its my generous nature
It would be nice to get some feedback from you if you decide to cooperate with your wife's need to have her fanny used by others.
One word of caution, check out your suspicions that she has someone in mind. The danger is that she is having an affair and is looking for a front to enable him to have more access to her. Of course you might like the thought of her having an affair. It won't be the last though. Good luck