Just hearing you say it already makes my cock rock hard.
You can still easily and clearly remember the first time your wife cuckolded you. It was the night of your 20th wedding anniversary and you had planned a romantic evening -- and had assumed the night would end with a "roll in the hay" with her. But that afternoon, she had simply matter of factly told you that she had decided to start dating other men and that she had a date for that evening with a man from her gym.
That was three years ago, and since then she has had at least one date almost every weekend and you have come to accept your role as a cuckold, and she often compliments you on what a good supportive cuckold you've become -- and even you have to admit that it does make you feel good when she says that to you.