As soon as we discovered that I was sterile, her girlfriend moved in part time and there was no more reason for penetration sex. It was a fair trade off as most of our sex was FFM threesomes and the two women were kinky and game for anything as long as it did not involve intercourse with me. Her g/f was married to a cuckold so their only rule was no intercourse with me. That was reserved for the cuck. My wife is tiny and found intercourse painful with me and only tolerated it to get pregnant. I am not big. More of my wife being too small so to her I am very big.

At least I was not cuckolded. My wife tried another guy and hated it. I was gentle compared to him and she swore off other men and said I was enough male for her. Yea! So life went on. Our g/f had her own room in our house, as did we all. She split her time between her cuck and us. We think her husband is bisexual too, which enabled her to spend long periods of time with us. She refused to tell us what the deal was but I do not think even a cuckold would let his wife spend half of her life living with another couple. I never pushed for a reason as I was having the time of my life.
Cut to a few years ago and we are now living far away from our g/f. She was to follow us but did not. Long story. My wife and I were a couple again. Our g/f provided each of us with the type of sex we liked. My wife is submissive and I like to be dominated in bed. Her g/f was naturally dominant in real life and would sigh with pleasure with each lash of the whip and actually drip down her thighs with excitement. She loved to hurt men. In our threesomes I either was not allowed to cum or got to masturbate while in pain of some sort. Only when we had one on one sex would I get oral or a handjob (mostly handjob) from my wife. Her girlfriend usually played with my nipples and balls while I brought myself to orgasm quickly to avoid more pain. That woman trained me to cum with a punch to the balls or by putting out a cigarette on the head of my penis. I miss her.

So were were a couple again and I liked very rough sex and my wife did not. Sex became a sometime thing only done because we felt that we should to keep our emotional bond going. I looked for a solution and found teasing and denial. My wife took to it like a fish out of water. This was a way she could dominate me without whipping me until my butt was crisscrossed with welts and bruises. My wife is not a penis fan. She likes sex with me but does not find a penis attractive or sexually stimulating. She gets off from either my moans of sexual frustration or nipple torture. She will torture my nipples some times if I do not moan from whatever else she is doing. She needs to hear me moan or have another women in bed to play with.
As the denial turned from one week to two and more, I suggested a chastity device as my hands would wander to my groin almost absent mindlessly seeking the pleasure of masturbation I once had. So we got a CB6000s and wore it as much as possible for over a year. Chastity was a solution to our problem of a post menopausal bisexual wife whose libido was low and leaning more towards females. It also turned my frustration of too little sex into a sexual fetish. She is happy. I am happy and in a few years, our girlfriend will come to live with us again. Life has been very good to me. Probably sounds worst than it was. We had fun. We had three high incomes coming in which allowed us to go all over the world and do a lot of fun things. We lived it up. Private sex clubs, vanilla dance clubs, restaurants, tropical nude beaches, etc.. The girls liked to vamp it up in front of straight people. Guys gave me the thumbs up and their spouses/girlfriends gave me the stink eye.
So chastity for us was not for the popular reasons. It was a solution to a problem that worked for both of us. Has nothing to do with being a better husband. My wife thinks I smother her with too much affection and material things. It was to take our current sexual life and make it a fetish instead of a problem.
What is your story?